I've had the bike hidden behind the A pillar experience and it is scary to realise that if I hadnt checked again as I moved away from the line that I could have caused an incident.
I had a 120dB horn and Thunderbike longs on my Speedy and people still tried to kill me. I dont know what it is but I'm sure that over the years I have started to sense the impending negligent acts...sort of vehicular body language if you will. I dont always pick it up.
