When a truck is parked on a steep incline, what mechanical and physical measures must the driver take to prevent runaway vehicle movement?

1. Apply the spring parking brake firmly, engage a low gear (1st gear uphill / Reverse downhill), turn front wheels toward the curb, and place wheel chocks (podmetači za točkove) under the wheels
2. Leave the transmission in neutral with parking brake released
3. Rely solely on the hydraulic retarder lever
4. Tie the steering wheel to the driver seat with a rope