Speeding is one of the leading causes of teenage traffic crashes. A speed limit is the maximum legal speed one can travel on a road under ideal conditions. Remind your child that it is illegal to drive any faster than the posted speed. In addition, if conditions make the posted speed unsafe, drivers may be required by law to go slower. The speed limit is 25 mph in a school zone when indicated by a sign or signal and in residential areas. Otherwise, maintain the posted speed limit.