1. National Institute of Justice: Research in Brief;Alpert,1997
2. Why are there no lessons learned from road traffic incidents involving the police?;Best;Crim. Justice,2005
3. Motor Vehicle Conspicuity: an Assessment of the Contribution of Retro Reflective and Fluorescent Materials;Cook,1999
4. Emergency Vehicle Safety Initiative;FEMA,2014
5. Effects of Warning Lamp Color and Intensity on Driver Vision;Flannagan,2008