One pet peeve that gets to me is something that's done on a lot of commuter railways and S-Bahns, the 10/20 minute schedule. The schedule looks like:
2:10
2:20
2:40
2:50
3:10
etc, when it should be like this:
2:10
2:25
2:40
2:55
3:10
This minimizes waiting and allows for frequent service every 15 minutes..
What are your pet peeves?
The unending ambiguity of how to pay at an unfamiliar transit system.
You don't all have to use the same system but it'd be nice if your websites all actually said it somewhere easy to find. And said it at all.