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 Hawaii, speeding in a construction or work zone is considered a serious offense. The state enforces what is known as 'increased penalty zones' in areas where construction, maintenance, or utility work is taking place. According to Hawaii Revised Statutes §291C-105, the fines for speeding in these zones are doubled when workers are present and appropriate signs are posted. The law requires that the construction zone be clearly marked with signs indicating the reduced speed limit, and these limits are enforceable regardless of whether workers are on site at the time. Additionally, the statute considers not only the posted speed limit but also the conditions of the road, weather, and visibility when determining what constitutes a reasonable and prudent speed. Drivers are expected to adjust their speed accordingly to ensure safety. The penalties for speeding in a construction or work zone in Hawaii can include hefty fines and the addition of demerit points to the driver's license, which can affect insurance rates and driving privileges.