I've had an issue is when someone has been using their SatNav to gauge their speed rather than the bikes speedo, especially on particular windy roads. In this situation the SatNav will display the incorrect speed and they will actually be going faster than they think, potentially exceeding the speed limit.
How does this equate out mathamatically Bob, surely the GPS is giving a land speed based on positions calculated by satallite reception irrelevant of road curvature or straight line mapping?
You only have a 5mph speed differential to stay legal.
Ask yourself; Do the circumstances allow me enough time to complete the overtake safely without exceeding the limit?
That was my query is IAM training suggesting to stick below posted speed limits even if one could overtake safely with moderate acceleration to make the overtake then slow down to the posted speed limit, given the suggestion was to make "progress"and drive where possible at the posted speed?