Cambridgeshire, Northamptonshire and Bedfordshire Police have all apologised to a crash victim was left in a ditch for more than two hours because of confusion over which force should attend the call.
It happened on the B645 near Tilbrook, close to the border of all three counties.
Bedfordshire police eventually came to the scene.
The motorcyclist was taken to hospital and treated for an arm injury.
In a statement Cambridgeshire Police said: “It remains unclear as to which county the incident occurred in. It is clear that a better response should have been given.
“We will now work with Bedfordshire and Northamptonshire to find out what went wrong and ensure this is not repeated.”