- Curb_0: car_2 is parked at the curb, and car_1 is double-parked behind car_2. Car_2 is not clear.
- Curb_1: car_0 is parked at the curb, and it is clear.
- Curb_2: car_3 is parked at the curb, and it is clear.
- Curb_3: The curb is empty and clear.