Routes are a mechanic in TrP which allows players driving trolleybuses to choose which stops they would like to arrive at, and collect driver points/passengers for doing so.
Destination Boards

Drivers can select routes by placing 3 destination boards on the ZiU-682 and placing 4 destination boards on the ZiU-6205 and ZiU-682 EMU.
You can get destination boards by placing a Destination Board Container inside your trolleybus and using it
List of Routes
Below is a list of routes you can find in TrP by default, however some self hosted servers might use F3X to create their own Routes.