Braking distance is more affected by speed than thinking distance is – the difference in thinking distance between 30-70mph is just 15m, while the difference in braking distance is 69m.

Correct. As you would expect, twice the speed equals twice the stopping time. Now here's the catch. Say that same car going thirty required a hundred feet of skidding distance before stopping.

See, if you got this brain-teaser wrong, it's probably because you thought the stopping distance increases proportional to speed. Eighty mph is one-third faster than 60 mph; therefore, you may ...

Stopping vehicles as quick as ... as well as mass and speed. The greater the reaction time the longer the thinking distance. During the reaction time, a car travels at constant speed because ...