Here’s something which I’ve never seen outside Australia. See the string of red lights above the parked cars? Red means the space is occupied, green means it’s free. The information about free spaces is also displayed on matrix signs at every junction.
Instead of driving up and down rows, you can just follow the signs and glance down each row until you spot a green light.
Unnecessary? Maybe. But it sure does make finding a space more pleasurable in busy city multi-storey car parks.