METHOD FOR INSTALLING ULTRASONIC SENSOR ON SIDE FACE IN ULTRASONIC TRAFFIC VOLUME DETECTING APPARATUS

摘要

PURPOSE: A method for installing an ultrasonic sensor on side face in an ultrasonic traffic volume detecting apparatus is provided to easily detect traffic volume in case that there are cars or not, by using a difference of a reflected wave. CONSTITUTION: An ultrasonic traffic volume detecting apparatus detects a difference of a reflected wave from a road surface or cars and determines an existence and nonexistence of cars in an ultrasonic detecting area. The apparatus installs the sensor on a fixed angle not vertical to structures of a street side, in case that there are no cars in the ultrasonic detecting area, so as not to detect the reflected wave of the road surface.