Warwickshire Police are trialling the van to help detect dangerous driving.
The vehicle, which will be stationary at the side of the road while in use, is being trialled over a period of three months.
The warning letters, issued by police, will remind drivers that they could be fined up to £500 for not wearing a seat belt in addition to penalty points.
Body recovered from Leicestershire lake
Hinckley's Mayor Birthday Zip Line Challenge for Charity
Lake search for missing boy
A Warm Welcome to the Community for Hinckley
Warwickshire Recycling Centres to Temporarily Close During Peak Heat Hours
Leicestershire Recycling and Household Waste Sites to Close Early Due to Hot Weather
Two men charged in connection with Fire Arms incidents
£26m for new ambulances & crews in East Midlands
