IT IS getting common to find intelligent parking guidance systems in carparks, where red and green lights above lots let drivers know which lots are empty from a distance.
My 10-year-old said to me: "Daddy, why do we need the red light? You only need to know which lot is available, so just look out for the green light!"
How true! While an LED light doesn't consume much electricity, multiply it by thousands, and savings should be considerable.
