Yes. An octagon is a polygon.
It is in the shape of a shield.
An eight-sided polygon, like a stop sign is an octagon.
by making stop sign
There are several state and county roads with that number, and there's Interstate 81.
no
Signage is the only reliable way to tell. State highways will have a state highway sign (what that looks like varies from state to state), while interstate highways will have the blue and red interstate shield.
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.
The US Interstate Highway that runs through Helena, Montana is Interstate 15.
Interstate Highway System
The Highway sign says "Siskiyou Pass, Elev. 4,100', highest point on Interstate 5"
Interstate 40, Interstate 75, Interstate 65, Interstate 81, Interstate 55...
Interstate 64 and Interstate 77.