You should always remain a safe distance when you are behind another vehicle. The recommended amount of space that you should leave is one and half car lengths.
15 feet
3 seconds
Keep your headlights on low beam.
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The minimum following distance behind another vehicle that should be maintained is typically 3-4 seconds. This allows enough time to react in case the vehicle in front suddenly stops or slows down.
You should be 2-3 seconds behind a given point that the vehicle in front just passed. At 65 mph, that is 95 feet per second, so multiply by 2 or 3 and you should be 190-280 feet behind
The vehicle that ran into you should be at fault, and should have to pay costs associated with repairs to any damaged vehicles.
In California, the appropriate distance to stop behind another vehicle at a red traffic light is typically about one vehicle length or at least 3 to 5 feet behind the vehicle in front of you. This distance allows for safe maneuvering and visibility, particularly in case of emergencies. Additionally, drivers should ensure they can see the rear wheels of the vehicle ahead touching the pavement.
tap your brakes lightely to warn the vehicle
If you see an emergency vehicle with flashing lights behind you while driving, you should safely pull over to the right side of the road and come to a complete stop. This allows the emergency vehicle to pass quickly and safely. Remain alert and wait until the emergency vehicle has passed before merging back into traffic. Always follow local laws and regulations regarding yielding to emergency vehicles.
You double your distance in the rain. the seconds method is only a practices guide for beginners.
I think as long as you can see the vehicle in front of you, you should not have your highbeams on