When must you use your low beams while following another vehicle?

Answer: C — When you are within 150m of the vehicle

Using low beams while following another vehicle is important for the safety and comfort of all drivers on the road. The correct distance for switching to low beams is when you are within 150 meters of the vehicle in front of you. This rule helps to prevent the bright lights of high beams from blinding or distracting the driver ahead, particularly at night or in low-visibility conditions. By adhering to this regulation, you enhance safety by ensuring that the driver in front is not obstructed by harsh lighting, which can lead to accidents. It's crucial to remember that the intention behind this rule is to promote a safer driving environment, ensuring that all drivers can see effectively without hindrance from oncoming or following traffic. In terms of the other options, distances such as 100 meters or 60 meters would not provide adequate assurance that the low beams would be necessary for the comfort of the driver in front. If a driver were farther than 150 meters, there would likely be no risk of blinding the other driver, making it unnecessary to switch to low beams at that distance.