five groups of 40 drivers drove around an assessment route under normal traffic conditions. the groups were composed of drivers with 1,13,26,39 or 52 weeks' experience after passing the official driving test. average speeds in 30 mile/h and derestricted zones tended to become higher and car control tended to improve as the time following the official test increased. most of the drive indices for the newly qualified drivers differed from those obtained from a random sample of drivers. when compared to 363 drivers chosen at random, fewer of the newly qualified drivers were assessed as driving safely, but with increasing experience the proportion increased and tended toward that of the random group. this result is consistent with the reduction in the accident rate of drivers with increasing experience. (a).

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