Deer are more likely to roam Hertfordshire's rural roads at this time of year - and drivers are being urged to keep an eye out for them...
The male fallow deer is unpredictable and can travel several miles a day in search of a mate and will often cross roads at dawn and dusk in the process.
The most common time for the male deer to roam is at dawn and dusk, which in late September and October coincides with the morning and evening rush-hours.
The deer population in Hertfordshire, which mainly consists of fallow deer and muntjac deer, is widespread across the county with particular concentrations in pockets of woodland countryside.
Although deer are present in residential areas it is where major roads pass near wooded areas, with traffic moving at high speeds, that there is a particular risk of collisions with crossing animals.
Roads surrounding Knebworth Park and the Ashridge Estate near Berkhamstead have a higher than average number of collisions.
Ralph Sangster, Cabinet Member for Highways, told BOB fm: "In locations which are known migration crossing points we have taken steps to erect deer fences, especially on major new roads, but because the wild deer population is so widespread we can't protect every road.
We would urge motorists to be cautious and drive a little slower at this time of the year, especially on rural A roads".