Also, look for the small green exit number panel. If it's on the left side of the sign, your exit is also on the left side of the road. Navigating the Road When traveling in unfamiliar territory, interstate numbers give you valuable clues to your location and direction. Mile markers show the number of miles from where the route entered the state in which you are traveling. Their numbers increase as you travel east or north, and decrease as you go west or south.
Some states link interstate numbers to mile markers.
For example, Exit 40 may be at or very close to mile marker 40. Normal speed limits are reduced, traffic lanes may change and work vehicles may suddenly enter or leave the highway. Orange diamond-shaped warning signs are usually posted in advance of any construction. You may also see workers with flags or signs. Flaggers have the same authority as a regulatory sign, and you can be cited for disobeying their commands.