[2020] Public transport

When a vehicle is stopped longer than it takes for citizens to board/unboard, it's "unbunching" - it's waiting so that the vehicles on the line are spaced out more instead of all of them arriving at a stop right after each other.

The game has its own version of this, and Improved Public Transport also has an option for this. I'm not sure if you can actually disable it, but on the other hand, you don't really want that, as it makes your public transport a lot less efficient.