In SM North, a mall in Quezon City, the parking lot is dotted with rows of red and green lights. At first glance, you might think they're Christmas lights, but actually they're signs for drivers looking for parking spaces. Red means a parking slot is occupied, and green means a parking slot is vacant.
It's my first time to see this scheme implemented in a parking lot anywhere and I think it's a simple but ingenious service to customers. I wish other malls would pick this up.