The point at which physical decline with age begins adversely to affect a driver's capability has not yet been thoroughly studied. A survey of more than 3000 road accidents in Michigan involving drivers aged over 55 showed that in eight out of ten cases it was a driver over the age of 71 who had caused a collision by failing to yield, turning carelessly or changing lanes.
Older drivers are obviously more succeptible to injury in vehicle crashes, as well as being a potential higher risk through their own driving practice.
Reaction time in an emergency involves many different physical factors, such as the production of the nerve impulse, perception of the signal, choice of response and transmission to the muscles.
Some of these deteriorate more than others with age, but the overall effect increases the time it takes to respond for more elderly drivers.
Part of the ageing process, however, does include the collection of experience, often in the subconscious, which triggers earlier danger warnings than in younger drivers who have not experienced similar situations.
This maturity of judgement heightens the perception of risk and often leads other drivers to avoid a situation which might the put them to the rest.
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