Company car drivers failing to adjust from 'summer driving mode' remains a major factor in the rise in crashes expected in October.
Accident management company Accident Exchange points to heavy rain combined with leaf fall and greasy road conditions creating treacherous driving conditions during October.
The company says stopping distances on wet and slippery roads can double that in the dry - with a vehicle travelling at 40mph needing as much as 72 metres to stop.
A spokesman for Accident Exchange said: ' Unfortunately, it seems drivers are not immediately modifying their driving styles to suit the autumnal weather.
'October delivers some of the worst driving conditions of the year as the weather changes and the clocks go back, but drivers continue as if they were in the summer months.
'Motorists need to remember the basic laws of physics and common sence when the conditions under tyre change.'
Based on historic data, Accident Exchange expects 15 per cent more incidents in October compared to the average for the previous six months (April to September) and a full 21 per cent more reported accidents than in August.
Figures from the Department for Transport also show a rise in road deaths in October during the same comparative period.
In 2008, Accident Exchange reported more vehicles accidents in October than any other month - approximately 9% of all incidents for the year.