To provide a method informing a driver of a point by which a brake may be applied when a signal is turned to yellow, and the point proper to cross with an attention to back and forth and around at a crossing and a method in which any color of the signal in the case of an accident after the accident is determined.

A final brake-point indicating line 2 is made at a final point where a vehicle must apply brake at a free running distance+a braking distance=a stopping distance by a reverse calculation from a stop place obtained at the crossing when the signal is turned to yellow in traveling at a limiting speed, and a speed regulator 5 is juxtaposed. One or two of photographs of a vehicle or the like passed at a speed such as 10 km or more, by which the vehicle cannot be stopped in the vicinity of the stop place of the crossing on the stop place can be photographed by a camera 6 having high performance on the signal 1, in which a transparent window 8 is fitted to a part of the red eaves of the signal and a camera 7 having high performance at a place where the face of the driver is photographed in the case of the lighting of red by the one or two of cameras 6 and 7 by interlocking the signal 1 and a speed regulator 5.