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.
More top news
Another warm day with sunny spells although feeling a little cooler in the east
The Denne family from Milton Keynes say they want to show people what the world of farming is really like.
Some late spells of sunshine. Then, dry overnight with clear spells.