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 Illinois, the offense of speeding in a construction or work zone is taken very seriously and is subject to enhanced penalties. The Illinois Vehicle Code stipulates that speed limits in construction or work zones are enforceable regardless of whether workers are present. Drivers are required to adhere to posted speed limits, which may be reduced to ensure the safety of workers and motorists. The limits apply from the first sign indicating a work zone until the sign that marks the end of the zone. Fines for speeding in these areas are significantly higher than for non-work zone violations. For instance, the minimum fine for a first offense is $250 and a second or subsequent offense carries a minimum fine of $750. Additionally, if a driver commits a second work zone speeding violation within two years, their driver's license may be suspended. The law aims to protect construction workers and create a safer driving environment within work zones.