When is it safe to return to the road after a brake failure?

Returning to the road after a brake failure is only safe once all necessary emergency procedures have been successfully executed and the situation is confirmed to be safe. This means that the driver has taken the appropriate steps to assess the situation, ensure that the brakes are functioning correctly, and verify that the vehicle and surroundings are safe before re-entering traffic.

Engaging in emergency procedures could involve finding a safe place to stop, using any emergency equipment available, and determining the best course of action to either fix the issue or get assistance. Ensuring safety means considering not just the vehicle's braking system but also the surroundings and other road users, which is critical in preventing accidents.

The other options suggest actions that may not fully address safety concerns or could lead to further issues. For example, relying solely on the brakes appearing to work again does not account for the potential for further brake problems, and the idea of returning to the road immediately if no one is around dismisses the possibility of unseen hazards or a failure during operation.