"polygonum_on_google" wrote in message
...
On Sunday, 26 January 2020 10:45:19 UTC, Andrew wrote:
On 25/01/2020 15:40, Jimk wrote:
Andrew Wrote in message:
On 23/01/2020 21:58, Jimk wrote:
"Rod Speed" Wrote in message:


"polygonum_on_google" wrote in message
...
On Thursday, 23 January 2020 12:04:20 UTC, Jim GM4DHJ ... wrote:
Is it OK for rear fog lights to go off when the ignition is turned
off?....

Anyone ever fully understood why we only have one high intensity
rear fog
lamp?

Presumably so it isnt easily confused with a car coming towards you.



rear fogs are red you dumb **** !


Not if you are Red/Green colour blind.


Er no they are still red.


Are you sure ?.

I thought old fashioned traffic lights also had the
word STOP in black so that colour-blind people would know
that the red light was showing ?.

I think that the colours are defined in terms of wavelength(s) so they
really are red even if some individuals cannot perceive that as different
to green (or whatever).

I have argued that, now we have nearly universal LEDs, traffic lights
should have shapes to help further with identification. Starting with
octagonal red for Stop. Should be trivial to achieve - and it would have
been better if they had started doing so when the earliest LEDs were being
installed.

But is there any point given that colour-blind drivers
clearly can work out whether the traffic light is showing
red or green or yellow by which of the 3 lights is lit ?