Valets already do this. They have all the keys, so they can park cars two rows deep. https://en.wikipedia.org/wiki/Valet_parking#Efficiency https://en.wikipedi

Valets already do this. They have all the keys, so they can park cars two rows deep. https://en.wikipedia.org/wiki/Valet_parking#Efficiency https://en.wikipedia.org/wiki/Valet_parking#Efficiency