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. Here's a short quiz to test your driving smarts.
Warning signs tell drivers to be alert and to be careful.
If a car has airbags, you don't need to wear your safety belt. Safety belts should always be used in conjunction with air bags. Three-digit interstates connect to other major highways. If the first of the three digits is an even number, the highway usually connects to another interstate at both ends - in a loop. If the first of the three digits is an odd number, the highway usually connects with an interstate at only one end.