Legislation and requirements:
Vehicle manufacturers must fit DRL to new types of passenger car and light goods vehicle (car derived vans) type approved to European vehicle requirements from February 20111. In practice this means that any new model launched after this date, and many launched before, will be fitted with DRL. However, existing models on sale before this date without DRL fitted can continue to be sold and used indefinitely.
Similar requirements will apply to large vehicles (such as HGVs) and buses from 7 August 2012. Motorcycles do not currently require DRL to be fitted, but most manufacturers voluntarily opt for an AHO (Automatic Headlight On) system to be installed as an alternative. Changes to European legislation will, in future permit manufacturers to fit DRL on their motorcycles.
DRL activate automatically when the engine is started and remain on unless the headlamps are switched on. They may however remain off in some low speed and stationary situations. In general all other lights should remain off when the DRL are on but for a limited period some vehicles may be available which automatically activate the rear position lamps at the same time as the DRL.