More speed activated warning signs are being installed in Nottinghamshire after research showed they had a significant impact on speeding.
Various techniques are used to slow drivers down
A 12 month study has revealed that the flashing signs have reduced speeds by an average of 6%.
Sixteen signs carrying flashing messages have been installed at a cost of £5,000 each around the county.
They either warn the driver to slow down if they are exceeding the speed limit or flash a warning signal about a bend in the road or crossroads.
They have been generally installed at traffic blackspots or where someone has died in a collision.
Nottinghamshire County Council has been monitoring the signs over the last year and has concluded drivers do take heed and hit the brakes when the signs start flashing.
They now want to see them installed at more locations in the county which have a persistent problem with speeding