You should drive at a speed that allows you to stop:

Driving at a speed that allows you to stop within the assured safe distance that you can see ahead is essential for safe driving. This means that as you travel, you should be able to stop your vehicle before reaching any potential hazards within your line of sight. This distance can vary depending on factors like road conditions, visibility, weather, and your vehicle's speed.

By adhering to this principle, you ensure that you have sufficient reaction time to respond to unexpected situations, such as pedestrians crossing the road or sudden obstacles. It promotes defensive driving and allows for better control, significantly reducing the risk of accidents.

Other measures, like stopping within a specified distance like 150 meters or a certain number of car lengths, don’t take into account the variables that can affect stopping distance in real-world scenarios. Safe driving relies more on assessing the environment and maintaining a cautious speed that corresponds to the visibility and conditions around you.