Also, perhaps as a sidenote: this study was held in Denmark. A country were high viz is a lot less prevalent than in the UK. Could it be that Danes subconsciencely think "whoaaa high viz, something is wrong/up, I need to pay extra care", whereas their uk counterpart is more blinded by it because high viz is now so common they don't really see it as a warning sign? No studies, as far as I know have been made around this. Also, how can you compare the two countries when one country is pretty much only known for decent cycle infra?