[notahacker]

There are quite a few bus routes that wind back and forth, especially in urban and mountainous areas potentially offering a lot of shade from buildings and cliff edges for parts of the route anyway.

Whether these journeys involve long enough in direct sun to matter is another question.

[yreg]

Yes, but I believe that the diff of sun(RIGHT_SIDE) and sun(LEFT_SIDE) is the same, no?

Like the bus cannot get to the same destination by taking a route where the sun shines on the other side more. (Ignoring some fringe theoretical routes where you do a massive detour over equator.)

edit: I was too fast with my reply to read yours properly. Sorry.

> a lot of shade from buildings and cliff edges for parts of the route

I don't believe sitinshade.com handles those anyway.