App crashed when trying to load San Francisco map

Error message using the web browser implementation (running on an M2 Macbook Air, same error in both Safari and Chrome):

```
panicked at sim/src/mechanics/driving.rs:245:29:
Car with one-step route Router { path: Path { steps: [Lane(LaneID { road: RoadID(11899), offset: 1 })], orig_req: PathRequest { start: Position { lane: LaneID { road: RoadID(11899), offset: 1 }, dist_along: Distance(0.0) }, end: Position { lane: LaneID { road: RoadID(11899), offset: 1 }, dist_along: Distance(0.0) }, constraints: Bus, alt_start: None }, total_length: Distance(8.3374), crossed_so_far: Distance(0.0), uber_turns: [], currently_inside_ut: None, blocked_starts: [] }, goal: FollowTransitRoute { end_dist: Distance(0.0) }, owner: CarID { id: 17, vehicle_type: Bus } } had unexpected result from maybe_handle_end: Some(BusAtStop)
```