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An odd digit means the highway is a spur – that only one end connects to the Interstate Highway System – while an even digit means it is a loop – that both ends of it are connected to the Interstate Highway System.
Interstate highways are all constructed to precise standards, designed to maximize high-speed travel safety and efficiency. Interstate Highways also contain auxiliary routes, which are normally assigned a three-digit route number.
One of the clear ways that you can identify if you are on a U.S. highway or an interstate is by looking for a road sign. U.S. highways typically appear in a white shield on a black sign, although the exact specifics and shape of the shield may vary.
Learn the differences between highways, interstates, and auxiliary routes. Understanding the U.S. highway numbering system can help you optimize your trip planning, avoid congestion, and tackle weather conditions efficiently.
State highway naming convention differs a bit from the interstates. These roadways, which are denoted by black-and-white signs with badge symbols, use the same system of odd numbers for north-south routes, and even numbers for east-west routes. However, the number system is flip-flopped.
Guide signs include highway route markers (shields), which are reassurance markers, interchange signs, including advance guide and exit signs, and mile markers. Advance guide and exit signs usually feature control cities or other locations to help direct drivers toward their destinations.
There are two factors that go into three-digit numbering: The latter two digits reflect whatever two-digit interstate the route connects to. For example, I-395 connects to I-95, and I-270 connects to I-70. The first digit reflects the purpose of the road.
The U.S. Route shield is the highway marker used for United States Numbered Highways. Since the first U.S. Route signs were installed in 1926, the general idea has remained the same, but many changes have been made in the details.
Why don't you put metric speed and distance signs on the Interstate System? In the 1970's, the Federal Highway Administration (FHWA) considered converting highway signs, such as speed limit signs, to metric units of measurement.
Roadway signs in the United States increasingly use symbols rather than words to convey their message. Symbols provide instant communication with roadway users, overcome language barriers, and are becoming standard for traffic control devices throughout the world.