All this month Hertfordshire Police are stepping up patrols on the county's roads in a crackdown on speeding.
They will be using marked cars, and speed guns to slow people down.
The force hopes seeing more police around will mean drivers think twice about breaking the limit.
This week alone they've caught more than 100 people speeding.
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Remaining cold with sunny spells and further scattered rain and sleet showers. Any early snow will become restricted to hills.
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Any remaining wintry showers will ease tonight but it will stay cold and there's a risk of frost and icy patches developing.