PURPOSE: To prevent the collision of vehicles upon sudden meeting at an intersecting point.

CONSTITUTION: After transmitting parts 1L, 1R installed on a road B sense the vehicle V1, V2 advancing on the road B toward, the intersecting point C, they transmit the vehicle approach signal of radio wave form. On the other hand, since receiving parts 2L, 2R installed on the road A recognize the vehicle V1, V2 advancing toward the intersecting point C by receiving the vehicle approach signal of the radio wave form, and display vehicle approach notice together with the display of the traveling direction of the vehicle V1, V2, the driver of the vehicle V3, V4 traveling on the road A can recognize the vehicle advancing toward the intersecting point C, and then, an accident upon suden meeting at the intersecting point C is prevented.