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.
Leicester City Football Club CEO steps down
She's been at the club for 15 years.
Large new school building opens at Burbage School
In addition to being used by pupils, the sports centre is also available to the community.
Vehicle hits Earl Shilton property
The road is closed.
Missing Hinckley teenager hasn't been home in a week
Have you seen him?
Solar panels installed at Hinckley and Bosworth Community Hospital
The money saved will be reinvested in patient care.
M1 closed northbound due to 'serious collison'
Police say to find alternative routes.
Emergency sewer pipe repairs on A5 in Hinckley
Temporary traffic lights are by the BP garage.
The UK's only bonobo baby born at Twycross Zoo
"The birth of this baby bonobo is a truly extraordinary moment, not just for Twycross Zoo, but globally."
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Kenny sits in for Mark Foster
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