three.
3
3
It is more like car length than seconds when following another car. You should be at least 2 car lengths from the other car.
i guessed 8 seconds
How many car lenghts does your car have to be when you are stopped at a red light? a minimum of 2 seconds behind the car in front
2-4
100 ft4 seconds
It is not seconds, but car length. If you are seconds behind someone and they stop fast you will hit them.
at a set of red lights. how many feet should you be behind the vehicle in front of you?
It depends on how much traffic there is, how bad the rain is, and how fast you're driving. Definitely stay further behind the car in front of you if it's very heavy rain or if you're on the highway, but it's also safer to stay at least several car lengths (3-5 seconds) behind even in light rain or in slow traffic, because roads can always be slippery.
When driving behind another vehicle, it's generally recommended to maintain a following distance of at least three seconds. To determine this, pick a stationary object on the road, and when the car in front of you passes it, start counting. If you reach the object before you count to three, you're too close and should increase your distance. In adverse weather conditions, it's advisable to increase this distance to four or more seconds for safety.
You double your distance in the rain. the seconds method is only a practices guide for beginners.