I spend a lot of time in carparks, specifically at airports. Normally, I am rushing to park and get checked in. And, at most airports around the world, there are not enough parking spaces, and it can take a lot of time to find an empty bay. But, at OR Tambo International airport in Johannesburg, the carpark has added a wonderful new feature.

Above every parking bay a small unit has been installed in the ceiling. This has the ability to detect whether something is parked in the bay, and turns a bright light from green to red if the bay is full. This is a remarkable improvement - you drive into the parking area and scan the ceiling for green lights. Search time is dramatically reduced, and from the far side of the parking garage, you can set a course for an open parking bay.

Thanks ACSA. This is one of your best innovations ever!