Motorists and cyclist were caught out by black ice which caused chaos on Sheffield roads.
Police warned road users on Saturday morning following a spate of collisions.
Problems were reported in Crookes, Rivelin, Grenoside and Oughtibridge.
Keith Ainsworth said roads were ‘treacherous’ when he went out for a bike ride on Saturday morning.
He said one of the city’s major roads, the A57, was affected by black ice and questioned whether the roads had been gritted.
“I had never seen anything like the black ice on Saturday – there were crashes and people coming off bikes all over the place. I didn’t see any grit on the roads,” he said.
Coun Jack Scott, Sheffield Council cabinet member for environment, said gritters were out from 6pm on Friday treating priority roads and from 6am on Saturday to treat areas where ice had been reported.
“It is not unusual for water to run off the fields and collect in the roads. This can freeze and cause black ice.
“Beyond the gritting we’ve done, there is little action that can be taken to get rid of black ice, so it’s really important that people drive carefully.
“We are keeping a very close eye on the weather conditions and will continue to grit and respond.”