car park management system (system structure)

1.Howcar park management works? Firstly, the driver can learn all parking information from outdoor LED screen, just like available lots----- Level one: 88, level two: 66 Secondly, most of the crossing in the parking will be installed LED indoor screen which will show parking information area by area to the driver; Thirdly, there are LED indicators in the front of every parking space, which will keep green if unoccupied and turn to red when occupied. So the driver can learn which parking space is available from the color of LED indicators. Ultrasonic Detector LED indicator(Free) LED indicator(Occupied) 2.Cases 1) Poland Krakow Airport(1160 lots) 2) Philipine Mall of Asia(3160 lots) 3)Singapore Changi Airport(3850 lots)