When I was at the VA Hospital last night, I parked in the new garage, where I was quite impressed with this system they have of determining empty spaces:
When you pull in to a space the little light above that space turns red instead of green…
And then that updates the counter that's displayed at each turning of the garage (and at the entrance), showing how many spaces are available in that direction…
I know, I'm easily impressed, but still … cool.
Where have the days gone? 
Wow! That's a great idea!
I'm with ya. That is totally cool.
Wow, that is impressive.