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Stopping distances are measured in feet not in seconds. At 40 mph you're traveling 58.7 feet per second. The average driver reaction time is about 3/4 second which equates to 44 feet. After applying the brakes it will take approximately 82 feet to stop the vehicle. The total stopping distance for a car traveling 40 mph will be 126 feet when you include reaction time and actual stopping distance of the vehicle. If you divide 126' x 58.7' which is the distance traveled per second you get 2.14 seconds. This is assuming you're paying attention and have average reaction time while driving.
Initial speed = 20 m/sFinal speed = 0Average speed = 10 m/sDistance = (average speed) x (time) = 10 x 4 = 40 meters .
Its average speed was 1/2 of (30 + 0) = 15 meters per second.Distance = (average speed) x (time) = 15 x 7.2 = 108 meters .
30 km/h
DWT means driving while texting.
2-5 seconds
It all depends on the persons reaction time. Some people can react in under a second while others take up to 3 seconds to realize what has happened.
Driving while texting greatly reduces the driver's reaction time and will therefore put more lives at risk.
51.429 seconds (rounded)
Stopping distances are measured in feet not in seconds. At 40 mph you're traveling 58.7 feet per second. The average driver reaction time is about 3/4 second which equates to 44 feet. After applying the brakes it will take approximately 82 feet to stop the vehicle. The total stopping distance for a car traveling 40 mph will be 126 feet when you include reaction time and actual stopping distance of the vehicle. If you divide 126' x 58.7' which is the distance traveled per second you get 2.14 seconds. This is assuming you're paying attention and have average reaction time while driving.
12 to 15 seconds
Sure, and to your left, right and behind you.
i heard it was every 3-4 seconds :) which is heaps
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.
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.
This is a good question and I hope it will open discussion and attract input from many contributors. My perspective on this question relates to driving a vehicle. I think certain situations demand split second decisions/reactions and are dependent on the alertness of the operator as well as experience. Recent research has proven, and in some states legislation is enacted, that driving while sleepy/tired is as dangerous as driving under the influence (state of mind which = impaired).
Reaction times with no phone should (in theory) always be faster than reaction times with a phone