Daytime running lights: costs or benefits?
Rino Brouwer, Wiel Janssen, Jan Theeuwes, Johan Alferdinck, & Maaike Duistermaat, TNO Defense and Security
Extra to paper in D. de Waard, K.A. Brookhuis, and Antonella Toffetti (Eds.) (2006, in press), Developments in Human Factors in Transportation, Design, and Evaluation Maastricht, the Netherlands: Shaker Publishing.
Examples of stimulus material

Figure 1. Car only, Daytime running lights (DRL) on.

Figure 2. Car only, Daytime running lights (DRL) off

Figure 3. Car DRL on, nearby cycle, no lights

Figure 4. Car DRL on, far away motorcycle DRL on.