Why do brake lights have red color?
First, the red colour light travels the farthest distance than any other coloured light and therefore this red light can be seen over long distances than white light. This is a good reason the red colour is used for stopping the vehicle or as brake light. On another explanation, among the seven colours of white light, red colour has maximum wavelength and is least scattered by atmospheric dust and other particles. This is also another good reason why the red colour is used to indicated any danger sign or stop whenever brakes are applied on a vehicle or a motorcycle to alert the vehicle behind it to slow down or stop.
Brake lights are always behind the vehicle or any motorbikes.
Why indicators have amber color.
Indicator lights are amber in colour and can be located at the front, the rear and sometimes at the side of the car on both the left and right hand sides. The amber color for indicators has the highest wavelength in the visible spectrum and are used in cars or motorbikes to show an intended change of direction, whether turning left or right or moving out into traffic.
Indicators are used to show a sign of turning left or right.
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