I did google "bus-stops-on-a-slope", but nothing jumped out. What are "bus-stops-on-a-slope"?

I think they meant that the bus stop is on a hill maybe?

Asphalt, like glass, is an amorphous solid. When a heavy truck sits still on asphalt, asphalt will flow out from under the tires. Not only do you get a depression and eventually a pot hole where the tire was, and you get a little hill next to it.

You just about need an offroad vehicle to avoid hitting the street.