The signs flash up speeds and happry or sad faces
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A year-long study of the speed of more than 325,000 vehicles shows that road safety signs that flash up drivers' speeds do work, council chiefs claim.
Dorset County Council says its research suggests drivers' speeds is 5mph lower near speed indicator devices (Sids).
It compared the average speeds recorded at 35 sites to speeds before the Sids were deployed.
Further research is set to take place to see if speeds stay down a week after the Sid is removed.
Rob Camp, a council road safety officers, said there were concerns that drivers eventually ignore the signs if used too regularly.
"A study along one route where the devices have been operating almost every other week suggests the effect on speeds is not maintained.
"Regular commuters become used to the signs and their effect is diluted," he explained.
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