Rules I found online say 3m or 10ft with 9m or 30ft between. However, when I used to paint them with the highway dept in 1971 the length was 15 ft with 45 ft between. This appears to have changed. But you can measure the distance of the highway in miles or killometers!
The major highways are highway 50 highway 99 and highway 101 As well as Interstate 5, Interstate 40, Interstate 15, Interstate 8, and Interstate 80.
it is an interstate
The best way to travel from Nashville Tennessee to Knoxville Tennessee is by Interstate 40.
Interstate Highway 80.
Alaska does not have an interstate highway as an interstate highway requires 4 lane divided road connected at the very minimum state. Alaska is separated from the 48 other states. Thus can not have an interstate highway. Alaska has state highways and it has national scenic routes but are not able to have an interstate highway.
According to the US Department of Transportation Federal Highway Administration, the total length of the Interstate Highway System was 46,876 miles as of 2006. However, this number is constantly changing as more highways are being built or upgraded.
The US Interstate Highway that runs through Helena, Montana is Interstate 15.
Interstate 40, Interstate 75, Interstate 65, Interstate 81, Interstate 55...
Interstate 64 and Interstate 77.
interstate
Interstate 10
* Interstate 10 * Interstate 17 * Interstate 40