Final answer:
Usually, you should dim your high beams when you are within 500 feet of an oncoming vehicle or 300 feet of a vehicle you are following to prevent impairing the vision of other drivers.
Step-by-step explanation:
When driving at night using high beams, it's important to dim your lights when you get within a certain distance of an oncoming vehicle or a vehicle you are following to avoid blinding other drivers.
Although the exact distance can vary by jurisdiction, a common rule of thumb is to dim your lights when you are within 500 feet of an oncoming vehicle or within 300 feet of a vehicle you are following. This ensures that you are not impairing the vision of other drivers, which could lead to dangerous situations on the road.