Some idiots on the road can not even see an 18 wheeled Peterbuilt coming, so why do you think that a vest with two square feet of orange would help? When they have their phone stuck in their ear, they pull out in front of you as they are looking you in the eye. I have been hit from behind while sitting at a stop sign two times in my life, once in 1982 and once in 1990. Both times the light was red and the idiot's did not see me OR THE STOP LIGHT THAT WAS RED FOR OVER 30 SECONDS BEFORE I WAS HIT. One of the drivers had a road map streched out over the sreering wheel trying to determine which way to turn. If they can not see you sitting on a bike, I doubt they will notice a little bit of orange on your back. IMO