final report第5頁第2點提到 The use of DRL reduces the number of multi-party daytime accidents for cars by about 5-15%. All studies that have evaluated the effects of using DRL for cars have found a reduction of the number of accidents, but the size of the estimated reduction varies from study to study. 裡面提到日行燈降低白天車輛事故約5~15%
final report第5頁第4點提到 The use of DRL on motorcycles reduces the number of multi-party daytime accidents by about 32%. 摩托車使用日行燈降低在白天約32%的事故
European Union Directive 2008/89/EC requires all passenger cars and small delivery vans first type approved on or after 7 February 2011 in the EU to come equipped with daytime running lights.