A system and a method for reducing delays in road traffic is presented. The system and the method for reducing delays in road traffic, comprises a number of controllable traffic lights, at least one computer system for controlling the traffic lights, and at least one navigation system located in a vehicle and communicatively linked to the at least one computer system. The at least one navigation system is designed to transmit route data pertaining to the routes used to the at least one computer system. The computer system is designed to calculate vehicle arrival times at the controllable traffic lights, and additionally is designed to transmit request data based on the arrival times to the controllable traffic lights. The controllable traffic lights are switched under consideration of the request data to positively influence vehicle journey times and/or routes.