SI 2022/59. The Road Vehicles (Construction and Use) (Amendment) Regulations 2022. These regulations amend SI 1986/1078 The Road Vehicles (Construction and Use) Regulations 1986. Comes into force 14th February. Certain vehicles on the roads in Great Britain may utilise elongated cabs and rear aerodynamic devices and equipment which improve aerodynamic performance, CO2 emissions, fuel consumption and driver vision.