The universally accepted answer to this is:
2 seconds in normal driving conditions (good weather & dry roads)
and
5 seconds in inclement weather (ie: snow and icy roads).
Pick a stationary object by the side of the road (such as a telephone or hydro pole) and use it as the guage of measure. When yhr vehicle ahead passes it (lets use the pole), say out loud " 1, one thousand, 2, onethousand". you should have finished saying that before you reach the same pole or other marker.
15 feet
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.
i have no clue
True
i have no clue
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.
3 seconds
Keep your headlights on low beam.
1
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.
Highbeam headlights should not be used within city limits when there is oncoming traffic or when driving behind another vehicle, as the bright lights can blind other drivers and create a safety hazard.
Be prepared for sudden stops by keeping a cushion between you and the vehicle ahead