Thanks for posting this Graham1, I think it has highlighted the importance to be easily seen by other road users. It is very easy to think that other road users on spending 100% of their time looking for cyclists - they are not. As cyclists I'm sure we all are extra vigilant when driving a car, and can empathise with the needs of other road users and in particular cyclists.
Reading the post reminded me of an incident that occurred to me just before Christmas. I was driving the Transit back from the office, down the usual country roads which have high hedgerows with the Transits main beam on. As I was rounding a bend I could see another car was approaching on straight ahead and so I dipped the headlights. (I was travelling at 40mph the road limited is 60mph but it simply is not big enough for those speeds.) Once on the straight I could not see anything apart from the approaching cars headlights (which had now been dipped) and the hedgerow to the left -suddenly I became aware of a runner wearing dark red top and black leggings a few meters in front of the van. I hadn't seen her because of the oncoming headlights and the fact she was wearing dark clothing and no hi-viz. I used to race formula ford and have been taught how to stop a vehicle extremely quickly, which I did. How I didn't take the back of her head off with my wing mirror I will never know. I got home the final 2 miles and could still smell the breaks burning. I went into my house and sat in a daze for quite sometime shaking. It will be a day I never forget, unfortunately the runner probably already has.
Had the transit not been regularly serviced with good breaks, and tyres in good condition inflated to their correct pressure, and had the transit been loaded, she (if lucky) would have best been in A&E, but I feel the morgue would have been here final destination that day.
I tell this story because I think Graham1 has highlighted that it is the responsibility of road users to make themselves be seen - I remember a recent thread on this forum where we where discussing that pedestrians had responsibly to make themselves seen, why shouldn’t we expect this of all road users?