Posted speed limits by state and local governments must be adhered to by truck drivers. However, truck drivers are subject to additional rules regarding speed that must be followed. For instance, the FMCSA makes it illegal for truck drivers to travel too fast for conditions. Examples of conditions that require truckers to exercise greater caution and reduce their speed include wet and snowy roadways, reduced visibility, uneven roads, construction zones, and heavy traffic, among others.
Violating FMCSA regulations is a breach of law and may subject a trucker to civil liability for injuries caused in an accident.