Bikers using many of North Yorkshire's sweeping and winding roads are being warned to take extra care as the nights draw in and temperatures drop.
The county's police said a combination of poor visibility, high winds and wet or icy roads could prove dangerous for bikers across the county.
There are hundreds of miles of road favoured by riders both in the Dales and across the North York Moors.
Officers said there had been a number of fatal bike crashes in recent weeks.
Ch Supt Alison Higgins said: "Motorcyclists in particular are extremely vulnerable to the risk of road traffic collisions at this time of year.
"All it takes is for one tyre to lose grip on a damp patch of road or a painted road marking and the consequences could be severe.
"If the weather is horrendous and you don't need to ride, then simply don't risk it."
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