The improved soundproofing in new cars has reduced the effectiveness of sirens as a warning device - read why this has happened.
Human visual response
This discussion about the nature of human vision, spectral sensitivity, field of view, colour-blindness and age-related deterioration of the eye will demonstrate that the world is not just as you see it!
The influence of colour -
Colours are everywhere, but only some colours enhance emergency warning visibility.
Visual perception -
The length of time taken by drivers to recognise an emergency vehicle and plan safe avoiding action relies on the brain interpreting complex visual signals.
Visibility, conspicuity and visual effects -
A high level of contrast between the emergency vehicle and its environment is the most important attribute for conspicuity and whether a vehicle will be quickly seen & recognised or overlooked by other drivers.