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How did you manage to spot him? Did you just throw a cursory glance in his direction, or did you look properly?
I spotted him because I did look and spotted something that "didnt look right" and I tend to be a somewhat cautious driver. but it wasnt till later that I realised it was a bike.
I drive an asthmatic old VW transporter that would pull out quicker if I pushed it so I am more or less forced to take my time at junctions, which, of course, includes looking and I also like to make *sure* its clear before pulling out because it takes me a while to get up to speed and that truck on the horison can be on my bumper before I reach 30MPH

But I can easily see how others may have missed him under similar circumstances. (such as a more powerful vehicle which can pull out more smartly)
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I agree. 'If you don't know, don't go' is one of the first things you are taught during elementary driving lessons, so SMIDSY don't cut it.
But what if you dont know that you dont know (IYSWIM)
Consider the following bizarre sounding example.
I have put a brick on an otherwise clear table top in the middle of an otherwise empty room. I ask the “Experimental subject” to go into the room and get me whats on the table. For *some reason* he fails to see the brick on the tabletop, and concludes that the table is completely empty and that it was a trick question. How many people would go back to the table for a second look before coming out to have a go at me- just in case the brick has suddenly materialised there??
If this sounds unlikely it really isn’t. Think of all those times you may have put down a spanner or screwdriver (or note on your desk) and then cannot find it again. You spend ages looking for it, (typically only to find it again once you have given up and started doing something else) and then you find that it has been Right_in_front_of_your_face all the time?
And this is something that you are specifically looking for and that you know what it looks like!
I am sure everyone is familiar with the “Gorilla suit” gag by now but it is an excellent example of how someone can look straight at something and simply not see that it is there. They are not going to look more closely because they don’t realise that they haven’t seen something.
Vision is (my guess) about 1% optics 99% pattern recognition and data processing. It is not enough to be *visible* one needs to be *recognisable*
Luridly pattered "Hi Viz" oufits may be *visible* but they can also be confusing. they can break up the visible outline and can even blend it into the background People simply cannot to work out what they are looking at, how far away it is or how fast it is traveling In extreem cases the brain may even just treat the image as "Noise" and ignore it.
D
PS My "favorite" colour is a light colourd bright blue. It is not a colour that occurs much in undergrowth so always stands out from the background, It is also particularly good under twilight conditions. The "Blue" road signs really stand out and are visible from "miles" away. the others (reds/greens/yellows/browns/whites) only stand out when you are much closer. The same goes for leathers!
