On Mon, 17 Dec 2018 02:18:53 -0000, Rod Speed wrote:



"Kristy Ogilvie" wrote in message
news
On Sun, 16 Dec 2018 15:00:21 -0000, Max Demian
wrote:

On 16/12/2018 13:33, Kristy Ogilvie wrote:
On Sun, 16 Dec 2018 12:37:49 -0000, newshound
wrote:

On 14/12/2018 18:22, Fred Johnson wrote:
People with colour blindness shouldn't drive trains (or cars for that
matter).

And it's not very many, in fact I know of only one person who's
colourblind.

You may not know *of* many but I bet you know quite a lot. It's about
8%
of men, although many of them do not realise that, or discover it until
tested later in life.

I think you'd notice when you saw all the traffic light bulbs looking
identical. You're not safe to drive if you can't tell red from green.

I suspect they don't look *identical*, just not as distinct as to
someone with normal colour vision. They would use the position to
confirm which is which.

The only colour blind person I know says red and green look IDENTICAL
(presumably in his eyes the red and green receptors are shorted together
somehow). They're only different if one is lighter than the other, but
then light green and light red are the same, and dark red and dark green
are the same, so that might depend on the traffic light design and the
position of the sun.

Interesting. According to wikipedia, some forms of color
blindness cant see red at all so that they can't even see that
the red light on a traffic light is lit, it looks like its not lit.
Tho they can see green fine, so all they have to do is
know that if no lights are visible, it must be showing red.

That's no good, because you're very likely not to notice the traffic light is there at all. If I drive past traffic lights that are not operating (say ones still being set up for roadworks), I don't see them at all. I'm only looking for lit lights, as unlit ones are of no consequence.

And that Romania does in fact ban the color blind from
driving. But the color blind are trying to get that overturned.

It would be interesting to see if the number of accidents changes if they did that.