Philips LED Daytime Running Lights For MG3 2012 - 2013 , MorrisGarages  LED Daytime Running Lights

  Qeote: Duration of DRL Effects

  An often-used anti-DRL argument is that the positive effects of DRLs will erode over time as the public becomes accustomed to their use on the roadways. The following analysis proves this argument to be fallacious.

   U.S. Department of Health and Human Services, Public Health Reports , Vol. 110 ; No. 3 ; Pg. 233; ISSN: 0033-3549 (May, 1995). 

  The early and later DRL studies have shed light on concerns about the duration of DRL effects and the possibility of negative effects of DRLs on some road users. It has been suggested that when DRLs are first introduced into some part of the vehicle population, positive crash reduction effects will be found only because DRLs are new and unique and the vehicles that have them stand out from those that do not. Once people get used to seeing vehicles with DRLs, it is conjectured, their effects will diminish, and, if all vehicles have them, their noticeability will be reduced or drivers will come to ignore the extra information.

   All three of the early Scandinavian studies examined the effects of DRLs over a period of several years when DRL use was increasing, and DRL effects were estimated in Sweden and Finland when DRL use was nearly 100 percent. Thus to the extent that novelty or habitation effects occur, the effects of DRLs in the early Scandinavian studies were still positive over time and with close to 100 percent use. The later studies also suggest that the initial positive effects of DRLs do not dissipate over time. The reductions in multiple-vehicle crashes found in the Denmark studies, based on experience during the first 15 months of the law and then extended to include the first 33 months, were very similar. This similarity led the author to onclude that the effect was a permanent one and not due to the novelty of DRLs. In the study in Norway, the reduction in daytime multiple-vehicle crashes was maintained during the 3 years in which DRLs were required for all vehicles and use was close to 100 percent.

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