The infraction or offense of speeding in a construction or work zone is committed when the driver of a motor vehicle in a marked construction/work zone exceeds the posted speed limit or exceeds the speed limit that is reasonable and prudent under the circumstances or conditions—conditions such as the road (straight, curved, wet, dry, icy, flat, hilly); the weather (clear, foggy, raining, snowing); and the visibility (smoke from a grass fire or a tractor trailer obstructing the view).

Laws vary from state to state and in many states the construction or work zone speed limit only applies when workers are present and the zone is clearly marked with signs. But drivers should be aware that the construction or work zone often extends past where barrels or other barriers have been placed on the road and the reduced speed limit continues to apply until there is a sign indicating an increased speed limit.

Laws regarding speeding in a construction or work zone (and their enforcement) vary from state to state and among cities and towns (local ordinances) and are usually located in a state’s statutes. The penalty for speeding in a construction or work zone is usually a fine and demerit points added to the driver’s license or driving record. But the fines and penalties for speeding in a construction zone are usually much greater than for a typical speeding ticket or citation—for example, fines may be doubled.

In Massachusetts, speeding in a construction or work zone, also known as a 'Special Speed Zone,' is a serious traffic offense. The state imposes higher fines for speeding in these zones to ensure the safety of workers and other motorists. The law mandates that the reduced speed limits in construction zones are in effect at all times, not just when workers are present, and these limits are enforceable even if no workers are visible. Signs are typically posted to indicate the beginning and end of the work zone, and drivers are expected to adhere to the posted speed limits. Penalties for speeding in a construction zone in Massachusetts include increased fines, which can be double the amount of a regular speeding violation, and the assessment of demerit points on the driver's license. These penalties are designed to deter drivers from speeding in areas where road conditions and the presence of workers create a higher risk of accidents.