TODO for Phase 3 (Simulation)

cars

model cars parking
- clean up DrawCar construction, so parking can make them too
- populate a bunch of parked cars initially
- maybe render numbers on the cars to distinguish them
try to simplify straw_model step (less phases?)
better visualization
- draw moving / blocked colors (gradually more red as they wait longer)
- draw stop buffer in front/behind of cars
- draw cars in intersections, even when slightly zoomed out
- draw cars in slightly different colors, to distinguish them better
start implementing a second AORTAish driving model
reversible sim