What does the distance to be maintained from the vehicle ahead depend on?

Your answer is correct. The distance you should keep from the vehicle ahead depends on visibility, speed, and the condition of the road surface. Poor visibility, like fog or rain, requires a larger safety gap because it’s harder to see and react to dangers. Higher speeds also increase your stopping distance, so you need to leave more space. If the road surface is wet, icy, or uneven, your braking distance will increase, so extra distance is necessary. Always adjust your following distance to these conditions to ensure you have enough time to stop safely.