Working principle of the system Collect at real .... 22 Sep, 2008 3160 cars Philippines Mall of Asia ( Manila SM) 23 Oct, 2008 1500 cars Singapore Harbourfront Centre( OEM) 24 Nov, 2008 320 cars....
How PGS Works: Firstly, UD takes use of ultrasonic wave to detect the car space to see if it is occupied by vehicles and transfer relative command to LED Indicator which will turn from green to RED....