The invention emulates the actions and decisions of flagmen to control and to expedite traffic along a single lane past construction. The invention has two portable traffic signal light units with arms. One unit has a computer that controls the system, three video cameras, and two way radio communication. The other unit has three video cameras and radio communication to the unit. A remote control is also provided for starting and stopping the system along with a manual override of the system. A coding feature restricts starting, and stopping the system to users of the remote control. The system also protects itself against vandalism and functions during periods of obscured vision.