Traffic Control Systems in Construction Work Zones

Traffic control devices (TCD) in workzones are intended to provide sufficient guidance to motorists to help prevent collisions, especially with construction operations. Based on the study of their use in Illinois, they appear to be meeting this objective. However, what has been discovered in assessing workzone traffic control and crashes is that collisions occur more frequently than reports show and in ways not necessarily addressed in previous studies. For the most part, the layout of workzones and use of (TCD) within the actual construction area require no changes. They are protecting the workers from the motorists. What leads to collisions inside the construction area are reduced lane widths and lack of adequate escape, especially on limited access roadways. As a result, the most frequent type of collision is rear-end often caused because drivers stop or suddenly slow, and the following drivers are following too close. Outside the construction area, the problem appears related to poor driving behavior and need for some improved guidance for motorists especially within the merge areas. Outside the working area, changes to the layout are recommended.