amber 's nachts want blauw valt niet voldoende op. Het menselijk oog kan blauw licht namelijk slecht waarnemen bij een donkere achtergrond.
Dat is denk ik net andersom, rood/oranje is overdag beter zichtbaar en blauw 's nachts.
van
www.ambulancevisibility.com Blue is regarded as the authority colour in many countries and has been heavily used by police in the past. Legislation often covers its use on the roads. Blue being unlike any other colour commonly found on the roads is highly distinctive and recognisable. Blue can quickly generate an emotional response in experienced drivers due to its law and order history, thus producing relatively fast recognition and reaction times.
The blue coloured beacon or light can be washed out by strong skylight during the day, but its luminosity exceeds red at night. It is suggested but not confirmed by research, that blue has better perception in fog and snow conditions where high levels of diffuse light exist. The Purkinje shift moves toward blue sensitivity when the eye is in an adaptive state. Blue is unaffected by the Krovkov effect but can be harder for the eye to focus on the source than other colours due to chromatic aberration.
Red is the traditional emergency service warning and the “stop or danger” colour. Red is instantly recognised as an urgency warning when used by emergency services and legislation covers its use. Red is also the brake and tail light colour for all vehicles. Red emergency lighting, if not rotating or flashing can sometimes be lost in a sea of red tail lights from other cars.
Red does not bleed to white over long distances as other colours do. After yellow, red is the next best colour in daylight. The Purkinje Shift alters perception of transmitted red at night, although this effect is nowhere as pronounced as it is with reflected light from red surfaces at lower intensity levels. The Krovkov Effect can reduce the human perception of reds in some individuals. The use of a high transmission filter, passing red light containing a yellow component, increases the sensitivity of colour-blind individuals to red light sources (Green, p13). New car makers often use this red/yellow high transmission filter in red tail-light lenses or as their LED colour.
