What should be done with vehicles that are parked without an emergency brake system?

Using chocks is the appropriate action for vehicles that are parked without an emergency brake system because chocks are designed to prevent a vehicle from rolling or moving unintentionally. They are typically made from rubber or wood and provide a stable wedge that securely holds the wheels in place. This is essential for safety, particularly when the vehicle is on an incline or uneven surface where it may be more susceptible to rolling.

On the other hand, moving the vehicle constantly would not be a feasible or safe solution, as it would require unnecessary operation and could pose risks to both the vehicle and surrounding personnel. Leaving the engine running poses hazards, such as accidental movement or exhaust fumes affecting the immediate area. Securing with chains may not be practical or effective for all vehicles and could introduce complications if not done correctly. Therefore, using chocks is the best practice to ensure safety in securing vehicles without an emergency brake system.