Well this is somber data. According to this, my high viz fluorescent shell is worth jack.
Wood, Joanne M., Tyrrell, Richard A., Marszalek, Ralph P., Lacherez,
Philippe F., Carberry, Trent P., Chu, Byoung Sun, & King, Mark J.
Cyclist visibility at night : perceptions of visibility do not necessarily match reality. Journal of the Australasian College of Road Safety, 21(3), pp. 56-60.
Visibility limitations make cycling at night particularly dangerous. We
previously reported cyclists’ perceptions of their own visibility at
night and identified clothing configurations that made them feel
visible. In this study we sought to determine whether these
self-perceptions reflect actual visibility when wearing these clothing
configurations. In a closed-road driving environment, cyclists wore
black clothing, a fluorescent vest, a reflective vest, or a reflective
vest plus ankle and knee reflectors. Drivers recognised more cyclists
wearing the reflective vest plus reflectors (90%) than the reflective
vest alone (50%), fluorescent vest (15%) or black clothing (2%). Older
drivers recognised the cyclists less often than younger drivers (51% vs
27%). The findings suggest that reflective ankle and knee markings are
particularly valuable at night, while fluorescent clothing is not.
Cyclists wearing fluorescent clothing may be at particular risk if they
incorrectly believe themselves to be conspicuous to drivers at night.