(12)It is widely recognised that safety-belts are one of the most important and effective vehicle safety features. Safety-belt reminder systems therefore have the potential to further prevent fatalities or mitigate injuries by increasing the safety-belt wearing rates across the Union. For that reason, under Regulation (EC) No 661/2009 the safety-belt reminder system was made compulsory for the driver seat in all new passenger cars from 2014 in implementation of United Nations (UN) Regulation No 16, which established the relevant technical provisions. As a result of the amendment of that UN Regulation to take account of technical progress, it is obligatory to fit all front and rear seats of M 1 and N 1 vehicles, as well as all front seats of N 2 , N 3 , M 2 and M 3 vehicles, with safety-belt reminder systems from 1 September 2019 for new types of motor vehicles and 1 September 2021 for all new motor vehicles.