Design, assemble, program and test a safe prototype system to control the traffic through the roadworks that will meet the requirements of the client brief. To control the traffic, One90 Road Services has requested a prototype traffic light system that will, as a minimum: provide the correct operational sequence for the Set A traffic lights provide the correct operational sequence for the Set B traffic lights provide an option to override the operational sequence and change both sets of traffic lights to red, e.g. to stop all traffic on both sides of the roadworks when delivery vehicles need to enter or leave the repair area be able to safely restart the traffic light operational sequence, e.g. after the override has been triggered or at any other time