Black ice has caused more than 40 crashes mainly in rural areas around Sussex between midnight and 7.45am today (Monday January 28).
Police in Sussex are warning early morning drivers to be aware of the deceptive black ice.
More than 30 of incidents have involved just one vehicle sliding off the road due to the ice, which is difficult to spot.
So far none of the incidents is reported to have caused serious injury but a Sussex Police spokesman said; “Rush hour drivers are urged to take it easy on the roads, especially outside towns.
“The ice cannot readily be spotted, so please slow down and allow extra time for your journey.”