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 South Dakota, speeding in a construction or work zone is considered a serious offense. The state enforces specific speed limits in these zones to ensure the safety of workers and drivers. These limits are typically indicated by posted signs, and drivers are expected to adhere to the reduced speeds regardless of whether workers are present. The conditions of the road, weather, and visibility are also factors that drivers must consider to determine a reasonable and prudent speed within these zones. Penalties for speeding in a construction or work zone in South Dakota are more severe than for regular speeding violations. Fines are increased and can be doubled, and the offense may also result in demerit points being added to the driver's license. The exact penalties and procedures for enforcement can be found in the state's statutes, and local ordinances may also apply. Drivers should be aware that the reduced speed limit in a construction zone continues until they see a sign indicating that the speed limit has increased, which may be beyond the physical area marked by barrels or barriers.