This may sound sad but even when I'm travelling as pax I always carry a hi-viz & wear it when I'm walking from the apron to the terminal (as is invariably the case with the lo-co carriers) - odd looks maybe, but that better than the crowd you'd get round you on the floor in a pool of your own blood!
I've spent far too much of my life airside dodging juvaniles in baggage trucks & tugs who drive around with their heads up their rear ends - figure if I can be seen slightly better they at least have time to realise they're going to hit me!!
Although, there is an "in" joke in the company which goes something along the lines of "if you're wearing hi-viz you're fair game...." !!