Drivers and cyclists have been warned to be extra careful on the roads this autumn, with the number of fallow deer in the UK at an all-time high.

Hertfordshire County Council has issued the warning as at this time of year the male fallow deer can be "unpredictable" and travel several miles a day in search of a mate, crossing roads in the process.

The most common times for the male deer to roam are at dawn and dusk, which in late September and October coincides with the morning and evening rush hours.

Phil Bibby, executive member for highways and transport at Hertfordshire County Council, said: "We would urge drivers and motorcyclists in particular, to be cautious and drive a little slower at this time of the year, especially on rural and semi-rural roads."

The council has issued tips to help motorists and motorcyclists avoid collisions with deer.

These include reducing speed in high-risk areas, using full beam headlights when safe to do so, and leaving a safe distance from the vehicle in front in case they have to take action.

More information is available via bds.org.uk.