A method for measuring the position of a surface of a vehicle on a roadway, comprising the steps: a) transmitting a first radar beam from a transmitting position above the plane of the roadway in a first primary transmitting direction inclined downwardly at an angle, receiving a first reflected radar beam at a receiving position (E i) above the plane of the roadway in a first primary receiving direction inclined downwardly at an angle, and converting the first reflected radar beam into a first received signal (R i), wherein the transmitting position and the receiving position (E i) are distanced from one another and the first primary transmitting direction and the first primary receiving direction lie in a common plane; b) transmitting a second radar beam from the transmitting position in a second primary transmitting direction, which is inclined downwardly at an angle and different from the first primary transmitting direction, receiving a second reflected radar beam at the receiving position (E 1) in a second primary receiving direction which is inclined downwardly at an angle and different from the first primary receiving direction, and converting the second reflected radar beam into a second received signal (R i), wherein the second primary transmitting direction and the second primary receiving direction lie in said common plane; c) selecting the received signal (R i) having the greatest signal strength (RSSI i); and d) determining the said position from the transmitting and receiving positions (S, E i) and from the primary transmitting and primary receiving directions (19, 22) of the received signal (R i) having the greatest signal strength (RSSI i); wherein steps a) and b) are carried out either chronologically in succession or at the same time. a) transmitting a first radar beam from a transmitting position above the plane of the roadway in a first primary transmitting direction inclined downwardly at an angle, receiving a first reflected radar beam at a receiving position (E i) above the plane of the roadway in a first primary receiving direction inclined downwardly at an angle, and converting the first reflected radar beam into a first received signal (R i), wherein the transmitting position and the receiving position (E i) are distanced from one another and the first primary transmitting direction and the first primary receiving direction lie in a common plane; b) transmitting a second radar beam from the transmitting position in a second primary transmitting direction, which is inclined downwardly at an angle and different from the first primary transmitting direction, receiving a second reflected radar beam at the receiving position (E 1) in a second primary receiving direction which is inclined downwardly at an angle and different from the first primary receiving direction, and converting the second reflected radar beam into a second received signal (R i), wherein the second primary transmitting direction and the second primary receiving direction lie in said common plane; c) selecting the received signal (R i) having the greatest signal strength (RSSI i); and d) determining the said position from the transmitting and receiving positions (S, E i) and from the primary transmitting and primary receiving directions (19, 22) of the received signal (R i) having the greatest signal strength (RSSI i);