Bridges: Thanks for the feedback!
Trucks: This is something we've been wondering how to solve. If you have a loop with no branches there's a bit of a timing component to how you place the garages, which I hate. Smarter AI is planned and will help in most other cases. Maybe trucks should recognise when they're in a loop and slow down a little? It'll be tricky to do.
Roads: We're gonna (slowly but surely) add more feedback to the UI. This case is hard to calculate though, so it's likely to always be left up to the player to feel and tweak it out.
Thanks again for playing!