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You should get a sufficintly accurate indication after 10 seconds and, that way, you save a whole 50 seconds!
Distance equals speed multiplied by time. For example, speed is 72 km/h and time is 200 seconds or 200/3600=0,0(5) hours, so the distance traveled is 72*0,0(5)=4 kilometers.
It is generally recommended to measure the distance in seconds rather than feet or car length when following another vehicle. This is because measuring in seconds provides a more accurate representation of the time it takes to react and stop in case of sudden braking. It also allows for a consistent measurement regardless of the speed of the vehicles involved.
10-15 feet . You need to be 2 full seconds behind. Pick stationary object vehicle in front passes, then count how long until you pass the same object. Not 2 seconds? Increase you following distance! Another rule of thumb is to stay behind one car length for every 10 miles per hour, so at 35 mph you would want to be 3 and 1/2 cars behind the car in front of you.
5
It is five seconds
I usually leave 5 to 6 seconds minimum following distance under those condition, and have had no accidents . . .
If it is raining and you are tired, you probably should not be driving - you are a hazard to yourself and other drivers when you drive in those conditions. However, if you must drive, keep a solid 10 to 15 seconds of following distance between you and the next car on the road.
If it is raining and you are tired, you probably should not be driving - you are a hazard to yourself and other drivers when you drive in those conditions. However, if you must drive, keep a solid 10 to 15 seconds of following distance between you and the next car on the road.
Car lengths
Seconds
Several hundred. You should stop and rest.
2 seconds
4
4 to 5 seconds
Usually in good conditions you want to have 2-3 seconds of distance between you and the car in front of you, for every hindrance (ie. rain) you add one second of distance. So in your case being both tired and having to deal with rain, i would say have at least 5+ seconds distance. I wouldn't recommend driving while sleepy as your reaction time and judgment decreases while tired, if you think you are getting too tired please pull over and take a quick nap.