I added a hi-viz vest to my gear one year ago and I have noticed a big difference, particularly in night riding on urban interstate highways. Close tailgating has become rare. I also have high conspicuity tape all over my helmet and the combination is pretty striking from behind. I no longer feel comfortable without it. While it is only one factor in my safety plan, whatever lowers my risk is likely to keep me riding longer!
2013 Ninja 650 ABS
2012 CBR250R ABS