500 Yards (1500 feet)
Your cars lights may be dimming and lighting up again due to a faulty bulb.
Under normal conditions a safe following distance between your car and a motorcycle should be?
A "foot-day" might be the distance you can walk in a day. A "car-week" might be the distance you can drive in a week. A "light-year" is the distance light travels in a year. (Through vacuum.)
Seconds
It could be because its running out of battery
if you are experiencing this with your own car, it may be a drained battery.
The best way to find out if your headlights are dimming is to turn your lights on when it's dark at your house and check and see. Also you can go to auto zone and ask if the lights in your car are dimming and what you can do to fix them.
car lengths
7 car lengths
Since it was the following car's responsibility to maintain a safe stopping distance from the car in front, the car that rear-ended the stopped vehicle is at fault.
The distance behind the car you are following
What is the adjective in the following sentence? The car moved very slowly down the street, stopping at every light.