The Oregon DOT (ODOT) has recently begun to emphasize the importance of mobility during construction. New procedures have been created to help manage mobility on a statewide basis, including the…

Arizona DOT Equipment Services tries to adjust flash patterns on vehicle lighting systems to avoid critical flash frequency ranges that may be associated with ‘hypnotic’ or seizure effects. Arizona Revised…

North Dakota DOT has not done specific research concerning vehicle warning light effectiveness. Strobe and LED lights are allowed on NDDOT vehicles and equipment. LED lighting is preferred and used…

New York normally uses 4 inch wide markings, with 6 inch markings on interstates. Work zones do not use wider markings.

In Florida: Regulatory speeds should be established to route vehicles safely through the work zone as close to normal highway speed as possible. Traffic Control Plans (TCPs) for all projects…

Illinois uses Type I or Type II nonremovable marking tape or paint at the option of the contractor, except paint is not allowed for final wearing surfaces unless authorized by…

Ohio DOT completed some ad hoc testing of vehicle warning lights in October 1989. However, the gathered data are now considered to be too old to be useful or of…

Comprehensive work zone speed enforcement operational plan developed by the South Dakota DOT, Associated General Contractors Association, and the Highway Patrol. The program utilizes local law enforcement officers and double…

Mississippi DOT has not done any specific research regarding vehicle warning light effectiveness. Rotating halogen, strobe, and LED warning lights are allowed on MsDOT vehicles. Maintenance, construction,and emergency callout vehicles…

Iowa DOT does not have written reports regarding tested use of warning lights. Lights are demonstrated by field test on vehicles to see if they are adequate, but no formal…