At 40 mph, a vehicle travels approximately 58 feet per second. The average reaction time for a driver is about 1.5 seconds, which means the reaction distance would be around 87 feet (1.5 seconds x 58 feet/second). Additionally, the stopping distance will vary depending on road conditions and vehicle braking capabilities. Therefore, at 40 mph, the total stopping distance can be around 120-140 feet when factoring in both reaction and braking distances.
You might be in good condition but what about the road condition (wet, icy), the state of you tyres (good tread or worn), the state of your brakes?
40 mph = 40 miles in 60 minutes = 20 miles in 30 minutes.
Just divide the distance by the speed.
Distance = Rate * Time or, for our purpose Time = Distance/Rate at 50 mph Time = 4.5 miles/50 mph = 0.09 hours = 5.4 minutes ----------------------------- at 40 mph Time = 4.5 miles/40 mph = 0.1125 hours = 6.75 minutes ---------------------------------------------------- 6.75 - 5.4 = 1.35 minutes saved
The vehicle's reaction distance depends on the driver's reaction time.
44feet
You might be in good condition but what about the road condition (wet, icy), the state of you tyres (good tread or worn), the state of your brakes?
40 mph = 40 miles in 60 minutes = 20 miles in 30 minutes.
Stopping distance at 40mph = 36m
Just divide the distance by the speed.
Distance = Rate * Time or, for our purpose Time = Distance/Rate at 50 mph Time = 4.5 miles/50 mph = 0.09 hours = 5.4 minutes ----------------------------- at 40 mph Time = 4.5 miles/40 mph = 0.1125 hours = 6.75 minutes ---------------------------------------------------- 6.75 - 5.4 = 1.35 minutes saved
Since the two distances are equal, the average is (40 mph + 60 mph)/2 = 50 mph.
85 feet
Time = Distance/Speed = 25 miles/40 mph = 0.625 hours = 37.5 minutes.
Time = Distance/Speed = 40/60 hours = 40 minutes.
A good rule of thumb is to keep a distance of one car length, about 10 feet, for every 10 mph of speed, so at 40 mph, you should be 40 feet behind the car in front of you. Obviously, this is harder to do in heavy traffic.