I remember the day I passed my motorcycle test. Passed, returned to the motorcycle school office, gave their bike back and their hi viz best, went across the road and collect my new Suzuki bandit, within one mile I had two malicious cut ups, turned around, went to the local bike shop, got a hi viz vest… And most of the shit driving stopped.
Forgot the vest one day and I hit a car pulling out in the first ten minutes.
It also works on a bicycle.
I wear one of these on my road bike. People give you more space, but it won’t stop the kind of idiots who jump lights… But everything helps. Cyclists who wear all black are just more difficult to see, and you are just not helping yourself.