- Curb_0: car_2 is parked at the curb, and car_0 is double-parked behind car_2. Car_0 is clear.
- Curb_1: car_1 is parked at the curb, and car_3 is double-parked behind car_1. Car_3 is clear.
- Curb_2: The curb is empty and clear.
- Curb_3: The curb is empty and clear.