Final answer:
In many jurisdictions, it is illegal to use or even flash high-beam headlights within a certain distance of an oncoming vehicle to prevent blinding and ensure road safety.
Step-by-step explanation:
In many jurisdictions, it is illegal to use or even flash your high-beam headlights within a certain distance of an oncoming vehicle. This distance varies depending on the specific laws of the jurisdiction, but it is typically around 500 feet. The purpose of this regulation is to prevent the blinding of oncoming drivers and ensure safe visibility on the road.