Police are urging bikers to learn more about safety and speed

Operation Biker will also see more patrols to catch people speeding.

Motorcycles have been clocked at 139mph on the A509 at Wollaston, a public highway with heavy traffic and no safety fencing.

Pc Gary Haynes said: "I'd advise motorbike riders to think very strongly about their own limitations."

Northamptonshire saw a strong increase in the number of road deaths last year.

Nine bikers died on the county's roads between January and June - compared to seven in the whole of 2002.