Got you there!
A beautiful Café bike sometimes looks very fast even when not moving. That was not really the case here.
Old chronometric speedometers sometimes behave a bit peculiarly. Among other things the hand of the speedometer moves in increments, in steps. Another oddity is that, if the wire suddenly comes off, or breaks, the hand will remain pointing at the speed of the moment.
The thing is that, in this case, the incident took place on a small road, far away from any highway. The driver suddenly realised this and started to think intensively to come up with a story to serve an inquisitive police officer in case he ran in to a routine police check point.
Please, don't get upset, it's not a mph speedo but a kph one....
The speedo also doubles as a fly screen.