*Criteria: A work zone is defined in the Manual on Uniform Traffic Control Devices (MUTCD) as an area of a roadway with construction, maintenance or utility work activities. Work zones are typically marked by signs, channelizing devices, barriers, pavement markings and/or work zone vehicles. The zone extends from the first warning sign or high-intensity rotating, flashing, oscillating or strobe lights on a vehicle to the “End Road Work” sign or the last temporary traffic control device.