Motorists were facing severe delays this evening after heavy snowfall across Hull and the East Riding in the run-up to rush hour.
Routes out of the city - including Hedon Road, Anlaby Road, Beverley Road and Spring Bank - were gridlocked and some rural roads were impassable as up to five inches of snow accumulated in some areas.
And weather forecasters warned this evening of more snow tonight and into Tuesday.
The Met Office said there would be heavy snow showers along the east coast, with minimum temperatures of -6C.
On Tuesday, the weather will be largely cloudy at first with more snow, some heavy.
Council gritters have been working throughout the day. Hull City Council said it would be gritting again at 6.30pm and 10.30pm tonight.
Despite that, EYMS reported many bus services were running up to 30 minutes' late in heavy traffic.
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One bus became stuck on ice at a bus stop outside the Four In Hands pub, Holderness Road, in east Hull.
The icy conditions led to a number of accidents, including on Spring Bank and at the Fiveways roundabout, both in west Hull, while a breakdown on the A63 near the Humber Bridge added to the congestion.
Among the most badly affected routes in the East Riding were the A614, at Driffield, and Arras Hill, near Market Weighton, where ice caused hazardous conditions.
In Holderness, five cars skidded on a hill at Aldbrough, blocking the road, and treacherous conditions were reported at Burstwick.
Humberside Fire and Rescue Service urged drivers to prepare for difficult conditions.
A spokesman said: "The advice we'd give is to always drive to the conditions, allow extra time and avoid making unnecessary journeys."
John Skidmore, head of streetscene services at East Riding Council, said: "The council is continuing to carry out winter maintenance operations in accordance with its winter plan and would like to assure the public that its salt barns are fully stocked and the area's salt bins have been replenished.
"The council will continue to monitor conditions around the clock and respond as necessary."
Earlier, Woodford Leisure Centre, in Holderness Road, east Hull, was forced to close because of a broken boiler.
And Driffield School closed early to avoid pupils becoming stranded Lantoft, Warter and Barmby on the Marsh primary schools were also affected.
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