Method for detecting the passage of a vehicle past a predetermined monitoring point on a road, wherein: the monitoring point is a stop line associated with a traffic light, a red-light signal is generated when the traffic light is red, an activating signal is generated when a vehicle passes the monitoring point in a predetermined direction, and at least one picture record of the passing vehicle is made when the red-light signal and the activating signal are generated simultaneously, characterized in that: from a remotely situated location at least one radar beam is transmitted substantially continuously to the monitoring point, reflections from the at least one transmitted radar beam are received at the remotely situated location, and from the received reflections it is determined that the vehicle is passing the monitoring point, wherein passing of the monitoring point is determined by calculating from the received reflections the distance of the vehicle from the transmitting and receiving location and comparing the thus calculated distance to the known distance between the transmitting and receiving location and the monitoring point, and wherein a series of values for the distance of the vehicle is calculated from a number of successively received reflections, and a detection that the vehicle is passing the monitoring point is valid only if this series of distance values corresponds precisely. the monitoring point is a stop line associated with a traffic light, a red-light signal is generated when the traffic light is red, an activating signal is generated when a vehicle passes the monitoring point in a predetermined direction, and at least one picture record of the passing vehicle is made when the red-light signal and the activating signal are generated simultaneously, characterized in that: from a remotely situated location at least one radar beam is transmitted substantially continuously to the monitoring point, reflections from the at least one transmitted radar beam are received at the remotely situated location, and from the received reflections it is determined that the vehicle is passing the monitoring point, wherein passing of the monitoring point is determined by calculating from the received reflections the distance of the vehicle from the transmitting and receiving location and comparing the thus calculated distance to the known distance between the transmitting and receiving location and the monitoring point, and wherein a series of values for the distance of the vehicle is calculated from a number of successively received reflections, and a detection that the vehicle is passing the monitoring point is valid only if this series of distance values corresponds precisely. from a remotely situated location at least one radar beam is transmitted substantially continuously to the monitoring point, reflections from the at least one transmitted radar beam are received at the remotely situated location, and from the received reflections it is determined that the vehicle is passing the monitoring point, wherein passing of the monitoring point is determined by calculating from the received reflections the distance of the vehicle from the transmitting and receiving location and comparing the thus calculated distance to the known distance between the transmitting and receiving location and the monitoring point, and wherein a series of values for the distance of the vehicle is calculated from a number of successively received reflections, and a detection that the vehicle is passing the monitoring point is valid only if this series of distance values corresponds precisely.