Final answer:
You should dim your headlights when following a vehicle at night within a distance of at least 150 to 200 meters to prevent glare and maintain road safety.
Step-by-step explanation:
When following a vehicle at night, it is required to dim your headlights to prevent glare that could impair the vision of the driver ahead of you. While laws vary by jurisdiction, it is commonly recommended that you dim your headlights within a distance of at least 150 to 200 meters (500 to 600 feet) when you are behind another vehicle to ensure safety. By dimming your headlights, you contribute to road safety by allowing other drivers to maintain their night vision and awareness of the roadway.