Why this site exists
Southern California is served by dozens of independent transit agencies. Trip planners are good at telling you which bus to catch. Almost nothing tells you whether the ticket already in your hand pays for it.
The rules, not just the route
Fare reciprocity, transfer windows, which passes cross county lines, and which ones quietly don't — the things that decide whether your trip costs one fare or four.
Where systems actually meet
Union Station, El Monte, ARTIC, San Bernardino Transit Center, Oxnard — plus the traps, like two stations sharing a name three miles apart.
It asks before it answers
When a question could go several ways, you get a short multiple-choice follow-up rather than a hedged wall of text covering every case.
Always shows its sources
Every answer links back to the agency page it came from, so you can check it yourself — and show a driver or fare inspector if it comes to that.