When you roll up to the lights, and another motorbike (stranger) rolls up next to you, do you notice that there is a ‘sizing up’ procedure that goes on. it only may take a few seconds or so, but there may be acknowledgment from the other motorbike guy, then, there is a process of sussing out the bikes. Brand, model, a/market exhaust, tyres, condition, etc. It may be done subconsciously if you are a long time rider, or you may be new, and seek to do it. it could well be another version of the ‘my dick is bigger than yours’, competition scenario. I have seen it done as a cager, with bikes in front of me at the lights, and now I am noticing that there is a ‘mutual sussing’ out as a rider.