Deputy Chief Constable Suzette Davenport said there are no common themse between the accidents which have claimed 15 lives so far this year.
She said: “It is desperately sad that we have lost 15 lives on the county’s road since January and our thoughts are with those who have tragically lost loved ones.
“Officers from the collision investigation team thoroughly investigate each incident and explore all possible causation factors.
“To date, our investigations have not revealed any common themes between these collisions and have included a variety of possible contributory factors, including fatigue, distraction, excess alcohol, inappropriate speed, vehicle defects and weather conditions.”
Corby and District Group of Advanced Motorists, runs courses twice a year aimed at improving driving standards.
Also covering Kettering and East Northamptonshire, its seven-week course is based on the police’s driving manual and trains people to be more aware when they get behind the wheel. The courses are held at the Conservative Club in Cottingham Road, Corby, every spring and autumn.
Thirteen drivers are now taking a course, with a further four people having one-to-one lessons.
Chairman of the group Dereck Lewis said: “Most drivers, when they pass their test, don’t bother to take any further instruction. People who take our course are 70 per cent less likely to be involved in a crash, as well as enjoy better fuel economy.”