pic of the av speed..
My average speed on the commute to work today.apparently by Troyka The Gallery, on Flickr
If I got my arithmetic right, and assuming you have 700 wheels, then this corresponds to a pulse frequency of 866 pulses per minute. That is in the right ball-park for the ignition pulses on a car engine at idle, so that is another possible cause.i was sitting at the traffic lights and my speedo was hitting 71mph im stationary and baffled.. its just a cheap wireless one from wilkinsons any thought on why it would do that? maybe the under road sensors?
I did over 100 mph once. I know I was going downhill at the time, but I think that was pushing it a bit.