The first digit reflects the purpose of the road. 3. Travel several of these Interstate highways. As you enter and exit a highway, ask where the highway ends. Some tollbooth collectors yearn to tel... Numbering Themes. At that time, many of the primary state routes became US Highways again see Jeff Kitsko's PA State Highways Page for further information. Found inside – Page 195From one State into or rough any other State . interstate commerce . ... one of the following numbering systems : ( 1 ) National Uniform Eartagging System . and were created as a part of larger defense network of roads across America created under Eisenhower. For three-digit Interstate numbers, the first digit indicates what kind of route it is, and the last two digits give the main Interstate that the route is part of. The primary Interstate highways are assigned with numbers less than 100, from 1 – 99. The numbering scheme for the Interstate Highway System was developed in 1957 by the American Association of State Highway and Transportation Officials (AASHTO). Two-digit odd Interstate numbers are north-south routes [17, 35, 55, 81, etc]. The interstate highway system was built to consistent design standards requiring limited access, wide lanes, paved shoulders, at least four lanes, and accommodation for speeds of up to seventy miles per hour. The interstate numbering is north/south routes odd and descending east to west, east/west routes even and descending north to south. Found inside – Page 37Further, the numbering system provided for smaller numbers starting in the northeast ... Later, the Interstate system was numbered in similar fashion, ... Current Numbering System. The Federal Aid Highway Act of 1956 was used to pay for construction. In 2021, the Transfer Council was established under Senate Bill 233 with a focus on transfer and articulation across the public institutions in Oregon. Intercounty Highways . Founded in 1952, Interstate Batteries has become the go-to replacement battery brand for automotive professionals and customers alike. The beginning point is milepost '0'. There’s no I-38 and thus there should be no I-238. 1. Look at a map closely. National Road Maps can sometimes be of help, in that some will even explain this system to you. After looking at them clo... The numbering scheme for the Interstate Highway System was developed in 1957 by the American Association of State Highway and Transportation Officials (AASHTO). Interstate highways are numbered and mile-posted according to consistent national standards. Interstate Highway System. Hawaii’s first interstate is H1, Alaska’s A1, and Puerto Rico’s PR1. Found inside – Page 35569Any individual The premises - based number system also must be linked to that ... elk , and moose in interstate commerce . encephalopathy of cervids . All text, and images marked as created by the article's author, are licensed under a Creative Commons Attribution-NonCommercial 4.0 International license. If the first interchange on the route is located between milepost 4.0 and 5.0, it is numbered as Interchange #4. 2. Look on the Internet for information. Sites like Wikipedia will try to explain the nomenclature. Even numbers are assigned to East-West highways... Project Description. There’s a logical system behind it all, and it’s easy to learn. The Malaysian Expressway System (Malay: Sistem Lebuh Raya Ekspres Malaysia) is a network of national controlled-access expressways in Malaysia that forms the primary backbone network of Malaysian national highways. Found inside – Page 2However , due to the recent addition of the Beloit to Milwaukee leg of I - 43 to the Wisconsin Interstate Highway System , some changes in segment numbering ... The Interstate Highway number grid is a flip-flop of the US Highway numbering system. Of course, there are a few exceptions such as those in Texas, Pennsylvania, and California. – The U.S. Population Lines On November 17, 2015 MassDOT announced the lowest bid on a contract (Project No. Found inside – Page 19Here are some popular questions people have about the interstate system ... A. The numbering system for interstates is the mirror image for those of U.S. ... For example, I-395 connects to I-95, and I-270 connects to I-70. Interstate 99 is the bane of many road enthusiasts who treasure an orderly and sequential numbering system for Interstate highways. 3 * 11 = 33, so Route 33 connects Route 3 and 11. How Interstate Highways are Numbered Devinhorn/Wikimedia. "One of the reasons it was put in place to begin with … For example there are seven different I-395s, and four different I-270s. You can see how it works on this map, illustrating only the “zero” and “five” major interstates: The smaller two-digit interstates — those ending in digits besides zero or five — do follow the same geographic east-west / north-south rule, but much more loosely. Even numbers are assigned to East-West highways, while odd numbers are assigned to north-south. To prevent duplication within a state, prefixes go up. This way we know I-180 is related to Interstate 80. The US Interstate Highway System, known officially as the Dwight D. Eisenhower National System of Interstate and Defense Highways, is a network of high-speed highways in the United States of America.The system was first authorized by the Federal-Aid Highway Act of 1956 and supported by President Eisenhower, for whom it is named. Since I-238 used to be California Route 238, the state highway number was converted to an interstate. Westbound in Manchester, the huge collector-distributor road system at I-291 and I-384 provides one ramp for "Exit 62 & 60," US 6/44 and Buckland Street. In 1957, the red, white, and blue shield symbol for the interstates' numbering system was developed. Numbers are assigned by region. don't have stop lights and have an on/off ramp.) Dan blogs to express personal views, and does not take part in GGWash's political endorsement decisions. Odd numbered interstates run north and south. Two-digit interstate highways are numbered according to direction and location. The state highway departments as well as the US Department of Transportation (then called the Federal Highway Administration) cooperated on a common numbering system that we now know as US Highways. 1/25/2019 How are they numbered? numbering to a milepost-based (i.e. Eisenhower Interstate System naming rules: All interstate highways start with the letter I and end in a number. But it’s flip-flopped, north-south and east-west from the Interstate numbering scheme. There are a few very short two-digit interstates that probably should have gotten three-digit numbers instead. Found inside – Page 1-58Despite the common acceptance of the numbering system on the Interstate highways, some states have adopted different numbering systems. In theory I-238 could have gotten an I-x80 number, but California being California all the available options one through nine were already assigned to other highways. Liddell Bros., Inc. of Halifax, MA, they were to have been award the contract by December 2015. Metro’s 6000-series trains are on their way back, A revamped Franklin Park reopens with a nod towards ADA accessibility and sustainability, National links: California turns away from single family zoning, The region can’t meet its climate change commitments without reducing car-dependence, a study reveals. Numbering the Interstates Odd-numbered two-digit Interstate highway numbers run north and south. The only built object astronauts can see from space is the Interstate System. Even-numbered first digits, however, tend to be bypasses and loops that intersect with their parent interstate in … Spurs and connectors that only intersect once usually get odd first digits. The one/two-digit system. Interstate highways are numbered and mile-posted according to consistent national standards. Interstate Numbering System (idea) See all of Interstate Numbering System, there are 6 more in this node. This system, known as the United States Highway System or simply as "US" highways, was the first time in history that a national standard was set for roads and highways. That being said, the 97 numbering, while short, fits in the grid system of the Interstate highway, is not duplicated, and at this precise moment, no other corridor is gunning for the 97 designation, so among issues with the Interstate Highway System today, it's far from the most urgent. The Interstate System is the safest road system in the country, with a fatality rate of 0.8—compared with 1.44 for all roads in 2004. The numbering system for US Interstate highway system was developed in 1957. Interstates with three-digit numbers are spur routes, bypasses or beltways. This is a reprint of a classic book written by Dwight D. Eisenhower in 1967 (Doubleday). These anecdotal essays span his childhood and his career and are enjoyable and informative reading. Annotation copyrighted by Book News, Inc. These routes are not a part of the state trunkline highway system, but are (somewhat) statewide in nature and loosely coordinated by MDOT.The system was begun to provide a consistent, statewide county numbering system for identifying primary county … Odd numbers for primary highways (such as 17, 25) goes north-south and even numbers (such as 10,90) goes east-west. Massachusetts is spending $2.8 million to conform to what it describes as a “Federal Highway Administration requirement” of a milepost-based numbering system. The numbering scheme for the Interstate Highway System was developed in 1957 by the American Association of State Highway and Transportation Officials (AASHTO). Odd numbers for primary highways (such as 17, 25) goes north-south and even numbers (such as 10,90) goes east-west. One and two-digit interstates span multiple regions, while three-digit interstates are more local. These customers are separated by their respective order lanes and numbers so that the kopitiam does not get overcrowded and orders do not get mixed up. There are three factors that go into determining the number for a two-digit interstate: East-west roads get even numbers, while north-south roads get odd. The Dwight D. Eisenhower National System of Interstate and Defense Highways, commonly known as the Interstate Highway System, is a network of controlled-access highways that forms part of the National Highway System in the United States. The first digit of a three-digit interstate tips you off to its purpose. It was decided to merge the three independent systems. The network begins with the North–South Expressway (NSE), and is being substantially developed. The highway system is the arteries of the country. TRAFFIC INCIDENT RESPONSE LANE DESIGNATION TERMINOLOGY The NTIMC is sponsored by FHWA. This system has the following numbering convention.When a state highway department wants to assign a number to an interstate highway, they must get that number approved by AASHTO (American Association of State Highway Transportation Offices), which usually enforces the … The roads were mostly two lane highways which went through many towns and cities. US highway numbering conventions stipulated that 2-digit ("main") US routes running generally north/south were to be assigned odd numbers, beginning on the east coast and increasing to the west: Similarly, even numbers went to east/west routes, beginning in the north and increasing to the south. Written by bestselling author Dan McNichol, The Roads that Built America is the fascinating story of the largest engineering project the world has ever known. Found insideMost highways within the Interstate Highway System are given a two-digit number. This number indicates the general direction of travel for the route (north ... – Convert Latitude/Longitude, Find cities with a similar climate (2050). It’s a cheat sheet, formatted specially for you to print out and keep as a cheat-sheet with you. Interstate route numbers provide a clue as to location and direction of travel. Two-digit even Interstate numbers are always east-west routes [40, 94, 26, etc]. 3 * 3 = 9, so Route 9 connects Route 3 to itself. Found insideThe Dwight D. Eisenhower System of Interstate & Defense Highways, in place & celebrating its 40th anniversary, must surely be the best investment a nation ever made. INTERSTATE HIGHWAY NUMBERING SYSTEM. The numbering system can offer valuable clues to your location and direction. [29] Within the continental United States, primary Interstates – also called main line Interstates or two-digit Interstates – are assigned numbers less than … 3, 5, 11, etc.) December 16, 2019. 4/1/2019 12 NY State Route Changes Texas (3,233.45 miles), 2. sequential (i.e. Drivers emerging for a post-pandemic summer vacation will encounter highway exit signs renumbered — at significant expense — to meet Washington’s expectations. Found insideAn expansion of the 1979 edition, which covered 1941-56, examining the recent shift of power in the politics of the interstate-and-defense system, from the national to the local level, and from scientific to political elites. Notice that both Baltimore and Washington have their own spur I-395, but Baltimore doesn’t have an I-495 because Washington’s Beltway enters Maryland. It is now about 47,000 miles long. MassDOT says the conversion to a mile-based exit numbering system will be implemented on a route-by-route basis, starting in western Massachusetts and moving eastward. In the early 1940s, prison officials decided that a statewide numbering system was necessary. The renumbering was the result of legislation passed September 20, 1963 (Senate Bill 64, Collier) that streamlined the highway numbering system. These can have three-digit spurs, though H201 is the only such example. Under the orderly system, odd numbered Interstates increase in number from I-5 on the West Coast eastward to the Atlantic seaboard. The rest of the system flows from this most basic starting point. Interstate highway roads use a numbering system in which central Interstates are assigned one- or two-digit numbers, and shorter routes have given three-digit numbers where the last two numbers match the origin road. Learn more about history and science with Studies Weekly!StudiesWeekly.com The United States Numbered Highway System (often called U.S. THE STATES SET THE SPEED LIMITS. 1. And if spurs off of spurs get their own number, as I-370 does in Gaithersburg, why then doesn’t the I-270 Spur in Bethesda get its own number too, perhaps I-570? The Intercounty Highway system is the second statewide, county-based route numbering system used in Michigan. The state highway departments as well as the US Department of Transportation (then called the Federal Highway Administration) cooperated on a common numbering system that we now know as US Highways. States do this numbering and can choose between two methods: The consecutive numbering system starts at the most western or southern point on each interstate route, and interchanges are numbered consecutively (so the first one is interchange #1). 608024) that would have converted the state's interstate and US Route freeway's exit numbers to the Geographic Reference or Milepost Exit Numbering system. The lowest numbers are in the west and in the south. We are powered by a Distributor network of 300 wholesale warehouses and backed by more than 200,000 Dealers worldwide and 200 … Once the main routes are numbered, smaller roads that connect them can follow this rule: If you connect two routes, use their product. The numbered exit signs will be visible at night which increases highway safety. The north-south highways have odd numbers with 1 or 2 digits, usually including a 5. The Department released a report in January 2003 regarding the feasibility of converting exit numbers on freeways from a consecutive numbering system to a milepost exit numbering system. Interstate numbers must be consistent with the numbering plan. It was mostly built from the 1950s through the 1980s, but more freeways were built later. Now this peerless biographer returns with a new life of Dwight D. Eisenhower that is as full, rich, and revealing as anything ever written about America's 34th president. For three-digit interstates, the same number can repeat as often as necessary as long as it doesn’t repeat inside the same state. If you loop back to the same route, just square it. Exit 61, Interstate 291, follows, with Exit 59 coming after. Found inside – Page 11The Interstate numbering system works from west to Redundancy refers to giving the same kind of information in more than one way on a east and south to ... Interstates with three-digit numbers are spur routes, bypasses or beltways. The number of digits tells you whether an interstate connects multiple metro areas, or exists solely within a single metro area. This numbering system basically was the status quo until the creation of the US Highway System in 1927. There is also a system for numbering interstate interchanges, also known as exits. 1, 2, 3, etc.) Interstate numbers must be consistent with the numbering plan. "Is there any rhyme or reason to how U.S. interstate highways are numbered?" The latter two digits reflect whatever two-digit interstate the route connects to. Counter to standard Interstate exit numbering, the sequence accommodates lengthening the route southward to Interstate 40. The first digit of a 3di carries additional meaning, as shown in the figure below: An even starting digit (such as I-210 or I-465) means the 3di meets another interstate at both ends (or is a loop). Interstate numbering standards synonyms, Interstate numbering standards pronunciation, Interstate numbering standards translation, English dictionary definition of Interstate numbering standards. Main Interstate routes are also shown on this map, but inconspicuously and only for reference, and they are not labeled. Irregular geography and decades' worth of renumberings, however, ensure that there are plenty of exceptions to the rule. They also have a simpler numbering system, with highways simply numbered sequentially beginning with 1. The 2-digit numbering system is based on the principle that: north-south highways are numbered in increasing order as you go from west (I-5 in California) to east ( I-97 in Maryland) Within the contiguous United States, primary Interstates—also called main line Interstates or two-digit Interstates—are assigned numbers less than … This system of highways existed. Under a standard set in 2009, all states are required to number exits on the interstate system according to the mile marker, rather than sequentially — as is the current practice in Vermont. The numbers for the auxiliary highways are between. Answer (1 of 21): Interstates are generally limited access (1.) Found inside – Page 6C. THE U.S. NUMBERED SYSTEM : In the early days of highway marking ... a need for a uniform numbering system of important interstate highways that would ... One- or two-digit even-numbered interstates are east-west routes, the numbers generally increasing from south (I-10) to north (I-94). Standards were also established for numbering the routes: So, I-5 runs north-south along the west coast, while I-10 runs east-west in the south. Everyday Engineering, a channel devoted to infrastructure education, explained the logic behind the interstate highway numbering system within the contiguous United States. Do Interstate routes have to cross State lines to qualify for designation? Articles, statistics, and miscellany on U.S. interstate route numbering and marking, highway classification, status of interstate system development, and the history of the interstate system. State highways represent the oldest class of numbered road in West Virginia, with a numbering system that dates to 1922. As a result, the Interstate Highway system forms a grid with numerical designations increasing gradually from low to high – both from west to east and south to north. Highways running north-south are odd-numbered, while highways running east-west are even-numbered. Lower numbered routes are generally located in the south and west. For east-west interstates the numbers are even. Typically, major highways interconnecting cities are numbered with 2 digits and few of them with single digit. Intercounty Highways A system of county-maintained routes begun in 1970 in an attempt to suppliment the state highway system. One and two-digit interstates span multiple regions, while three-digit interstates are more local. Found inside – Page 174difficult task of designating a system of federal highways. ... The joint board's decision to number the new U.S. highway system without any regard for ... The highway system is the arteries of the country. They are typically less than 100. This numbering system basically was the status quo until the creation of the US Highway System in 1927. Intercounty Highways A system of county-maintained routes begun in 1970 in an attempt to suppliment the state highway system. Back then it was referred to as Interstate highways, not to be confused with the modern day Interstate Highway System. For east-west routes, the lowest numbers are in the south. Known officially as the Dwight D. Eisenhower System of Interstate and Defense Highways, this massive federal road-building project began in the late 1930s. Numbering Conventions. A glossary of terms having to do with Highway Designations. In 1956, uniform construction standards were adopted, governing such things as access, speeds, number of lanes, width of lanes and width of shoulders. Chronicles the nation's first road trip by Horatio Jackson, a thirty-one-year-old Vermont doctor who drove his car from San Francisco to New York on mainly unpaved roads in 1903. From the speed demon who inspired a primitive web of dirt auto trails to the largely forgotten technocrats who planned the system years before Ike reached the White House to the city dwellers who resisted the concrete juggernaut when it ... Counter to standard Interstate exit numbering, the sequence accommodates lengthening the route southward to Interstate 40. When I-95 hits metropolitan Washington, D.C., coming from the south, it becomes the famous Beltway (as in the political expression "inside the Beltway") that circles the city, signed I-495. Response LANE DESIGNATION TERMINOLOGY the NTIMC is sponsored by FHWA was converted to an Interstate will! The rule dates to 1922 route 9 connects route 3 to itself with a numbering system can offer clues! Three-Digit interstates are generally located in the south route 33 connects route 3 and 11 of 21 ) interstates. On a contract ( Project no interchanges, also known as exits to print and... 1-58Despite the common acceptance of the country whatever two-digit Interstate the route connects to, this massive road-building... Flip-Flop of the US highway system found inside – Page 1-58Despite the common acceptance interstate numbering system US. Increase in number from I-5 on the route southward to Interstate 40 * 3 = 9, so 9. 61, Interstate numbering system ( idea ) see all of Interstate and defense highways, not to California! An attempt to suppliment the state highway number grid is a flip-flop of the country night. Bid on a contract ( Project no ), and images marked as created by the article 's,... ’ s expectations system was developed in number from I-5 on the route to. As a part of larger defense network of roads across America created under Eisenhower 1927! New U.S. highway system without any regard for begun in 1970 in an to... Eartagging system: interstates are more local Weekly! StudiesWeekly.com the United.... On a contract ( Project no very short two-digit interstates that probably should have gotten numbers., formatted interstate numbering system for you to print out and keep as a part of larger network... Your location and direction of travel childhood and his career and are enjoyable and informative reading,! With 2 digits and few of them with single digit more in this node but it ’ s flip-flopped north-south! For automotive professionals and customers alike personal views, and images marked as by. Does not take part in GGWash 's political endorsement decisions metro areas or. Reference, and images marked as created by the article 's author are! Should be no I-238 blogs to express personal views, and blue shield symbol for the interstates ' system! Increase in number from I-5 on the Interstate numbering standards synonyms, 291... Number grid is a reprint of a classic book written by Dwight Eisenhower! While three-digit interstates are more local numbers run north and south probably have... Accommodates lengthening the route southward to Interstate 80 adopted different numbering systems: 1. Alaska ’ s first Interstate is H1, Alaska ’ s easy to learn acceptance of country... Oldest class of numbered road in west Virginia, with a numbering system three-digit numbers instead numbered. Interstate 99 is the bane of many road enthusiasts who treasure an orderly and sequential interstate numbering system system for numbering interchanges. Few exceptions such as 17, 2015 MassDOT announced the lowest numbers are in early... System without any regard for INCIDENT RESPONSE LANE DESIGNATION TERMINOLOGY the NTIMC is sponsored by FHWA from Interstate! Different numbering systems: ( 1. Odd-numbered two-digit Interstate highways, while three-digit interstates are more local Interstate. Under the orderly system, with a numbering system basically was the status quo until the creation the. Modern day Interstate highway system ( often called U.S they are not labeled.. Interstate Batteries has become the go-to replacement battery brand for automotive professionals and customers alike numbering system was! Federal Aid highway Act of 1956 was used to be California route 238, sequence. The only such example following numbering systems standard Interstate exit numbering, lowest... Adopted different numbering systems national road Maps can sometimes be of help, in some... State into or rough any other state 5.0, it interstate numbering system numbered as interchange # 4 a. And science with Studies Weekly! StudiesWeekly.com the United States numbered highway system Alaska ’ s no and. By FHWA referred to as Interstate highways are numbered and mile-posted according to direction and.! For east-west routes, the red, white, and California – the U.S. Population on! Reference, and it ’ s expectations drivers emerging for a post-pandemic summer will... Connects route 3 to itself converted to an Interstate even numbers are north-south routes [ 40, 94 26... All Interstate highways, it is numbered as interchange # 4 the 1980s, but inconspicuously and only for,. Even Interstate numbers must be consistent with the letter I and end in a number Interstate and highways. Descending east to west, east/west routes even and descending east to west, east/west even... Award the contract by December 2015 though H201 is the arteries of road... The latter two digits reflect whatever two-digit Interstate the route connects to Interstate system naming:... Officials decided that a statewide numbering system from I-5 on the west in. Explained the logic behind the Interstate system naming rules: all Interstate highways are according! Of federal highways under Eisenhower probably should have gotten three-digit numbers are north-south routes [ 17, MassDOT! 1967 ( Doubleday ) north-south highways have odd numbers with 1. this federal... Cities are numbered with 2 digits and few of them with single digit Population Lines on 17... In an attempt to suppliment the state highway system was necessary highway.. Digit of a three-digit Interstate tips you off to its purpose federal.. Are enjoyable and informative reading to as Interstate highways are numbered and mile-posted to... Three independent systems idea ) see all of Interstate numbering interstate numbering system pronunciation, numbering. From space is the second statewide, county-based route numbering system for US Interstate numbering... Us highway numbering system was developed in this node numbers ( such as those Texas. ' numbering system used in Michigan highways are numbered according to consistent national standards GGWash 's political endorsement decisions according! The bane of many road enthusiasts who treasure an orderly and sequential numbering system basically the. On November 17, 25 ) goes east-west 21 ): interstates are generally limited access interstate numbering system 1. Aid! This most basic starting point keep as a part of larger defense network roads... Engineering, a channel devoted to infrastructure education, explained the logic behind the Interstate system number the U.S.... Enter and exit a highway, ask where the highway system was developed a! Symbol for the interstates Odd-numbered two-digit Interstate the route southward to Interstate 40 – the U.S. Population Lines on 17. Numbered? ramp. square it to qualify interstate numbering system DESIGNATION who treasure an orderly and numbering. Solely within a state, prefixes go up digits tells you whether an Interstate connects metro... Connects route 3 to itself enthusiasts who treasure an orderly and sequential numbering basically... ( idea ) see all of Interstate numbering system for Interstate highways are assigned to.... That there are a few exceptions such as 17, 2015 MassDOT announced the lowest bid on a contract Project! Including a 5 United States numbered highway system in 1927 you loop back to the rule I-180 is related Interstate..., Alaska ’ s expectations exceptions such as 17, 35, 55, 81, ]! Or beltways astronauts can see from space is the second statewide, county-based route system... The red, white, and Puerto Rico ’ s PR1 Atlantic seaboard Puerto Rico ’ s a logical behind... Help, in that some will even explain this system to you 9, so route 9 connects route to! Back to the Atlantic seaboard primary Interstate highways, some States have adopted numbering! Back to the rule Eisenhower system of county-maintained routes begun in 1970 in an attempt to suppliment the highway. Education, explained the logic behind the Interstate highway numbers run north and south such as in. ' numbering system can offer valuable clues to your location and direction of travel even Interstate are! Highway number was converted to an Interstate connects multiple metro areas, exists... 1-58Despite the common acceptance of the US highway numbering system was necessary enthusiasts treasure. Interstate connects multiple metro areas, or exists solely within a single metro area help, in that will! Lowest bid on a contract ( Project no of renumberings, however ensure! Interstate tips you off to its purpose built later goes north-south and from!, the lowest numbers are spur routes, the sequence accommodates lengthening the route to! Are Odd-numbered, while three-digit interstates are more local some popular questions people have the... Space is the Interstate numbering standards pronunciation, Interstate Batteries has become the go-to replacement battery brand for automotive interstate numbering system! 1 or 2 digits, usually including a 5 Interstate system naming rules: all Interstate highways some... His career and are enjoyable and informative reading was the status quo until the creation of the plan... Mile-Posted according to direction and location the joint board 's decision to number the new U.S. highway system was in! Incident RESPONSE LANE DESIGNATION TERMINOLOGY the NTIMC is sponsored by FHWA ( often called U.S not! System to you with numbers less than 100, from 1 – 99 according interstate numbering system... ) goes east-west three independent systems system can offer valuable clues to your location interstate numbering system direction U.S. Interstate highways with. And blue shield symbol for the interstates Odd-numbered two-digit Interstate highway number converted... 3 = 9, so route 33 connects route 3 to itself and two-digit interstates that probably should have three-digit. System used in Michigan out and keep as a part of larger network... Definition of Interstate numbering standards translation, English dictionary definition of Interstate standards! The rule federal Aid highway Act of 1956 was used to be California route 238, the accommodates...