Ask any police officer what the worst part of their job is and they won't hesitate to reply.

Knocking on a door and telling a wife or child their relative has been killed in a road accident is an experience they never forget.

Thanks to the efforts of the Government, county councils and police to improve road safety, the number of road deaths is falling in all categories except one.

Motorcycle deaths are likely to double this year from 2000 and those most at risk appear to be riders aged between 30 and 45 on sports machines out for thrills on country roads during summer weekends.

That is the finding of a study by Inspector Simon Labbett, of the Sussex Police road policing unit. His research is attracting interest from forces and councils round the country where similar increases are being experienced.

Mr Labbett is not out to spoil people's enjoyment but he is urging middle-aged thrill-seekers on sports bikes to take heed and he is right to call on families to join in the effort and, yes, even nag their loved ones to take care.

The study showed most deaths were preventable and families should do their bit as well.