They are in certain cars at my center on a trial basis. The problem with them is the unit mostly. When it goes out, you lose the turn signals. Funny thing is they were already installed on some P7s from CA and I was instructed to remove them. Now about half of them have them installed again as of about a year ago.
I find them really annoying, but they do get your attention. My attention is to turn them off. They replace the rear 4way flashers with alternating amber strobe flashing leds.
Our center tried using red square SAFETY flags on our city runs. They attached to the PC with a magnet. They worked but didn't stand up very well to the wind.
A few years back, for about a six month period they stuck reflective strips to our bumper on the left rear spring. They slowly started getting lost or just disappearing. Only a couple still have them intact.
A few years back, for about a six month period they stuck reflective strips to our bumper on the left rear spring. They slowly started getting lost or just disappearing. Only a couple still have them intact.