How Effective?

  • In Canada, the introduction of daytime running lights in 1989 led to a reduction of collisions in 1991 of 5.3 %, considering those collisions in which the DRL were expected to be effective and comparing 1989 and 1990 collision involvement rates (Tofflemire & Whitehead, 1997).

  • In Austria, a new law was introduced in 1982 mandating the use of DRL for motorcycles. It was found by Bijleved (1997) that this law reduced the number of victimised motorcyclists in daytime multiple vehicle accidents by about 16%.

  • Research using the Minnesota Department of Transportation crash database found that the overall crash rate among vehicles without DRL was 1.73 times higher than the rate for vehicles with standard DRL (Minnesota Departments of Public Health and Transportation, 2011).

  • The incidence rate, including all recorded bicycle accidents with personal injury to the participating cyclist, is 19% lower for cyclists with permanent running lights mounted; indicating that the permanent bicycle running light significantly improves traffic safety for cyclists (Madsen et al., 2013).

  • By the mid-1980s all automobiles in the U.S. were required to be fitted with central high-mounted brake lights. Vans, sport utility vehicles, and pick-up trucks followed after cars, in 1993. Some early estimates of effectiveness predicted that these high-mounted brake lights would reduce rear-end crashes by as much as 35%, but according to Lee et al. (2002), analysis of crash data indicate that the effectiveness is closer to 4%. This effectiveness offers support for the requirement of vehicles to have a high-mounted stop lamp, as defined in UN Regulation 48.

  • NHTSA investigated the crash-reduction benefits of light-emitting diode (LED) brake lights and central high-mounted brake lights (Greenwell, 2013). They compared crash rates for models of car which changed to LEDs from incandescent bulbs before and after the change. The main analysis showed a significant overall 3.6% reduction in rear-impact crashes with LED. However, the switch was not beneficial for all models of car investigated and the author also notes that all changes to LED brake lights were accompanied with other changes to the vehicles. This therefore means that the analysis is unable to support a firm conclusion regarding the crash-reduction benefit of LED brake lights.

  • Date Added: 03 Apr 2012, 08:17 AM
  • Last Update: 25 Jan 2014, 11:49 AM