I was trolling up Wellington Rd the other day passing other traffic but by no means wizzing by, probably no more than 5-10kph quicker. I looked at the speedo and it was pretty much saying I was doing 100k's. I looked around at the roadside, fences, etc and thought that there was no way I could be doing 100k's. I know I can motor along beside Tam in the car and do a speedo comparison at 80k, 90 and 100kph to find out if I'm over reading. If I am, is there a cure ?