road tax 
noun [mass noun] British
A periodic tax payable on motor vehicles using public roads.Cars over 30 years old are exempt from the National Car Test and there is no Vehicle Registration Tax or road tax to pay....
- The system is intended to automatically alert police if a car is stolen, if road tax hasn't been paid or the MoT is out of date, or if the driver is uninsured.
- If my little old banger is still chugging along at the start of next year, I might have to look at what's on offer at the Post Office when I pop in to renew my road tax.