Forecasters say ice, snow and 70mph winds are set to blight the Wednesday morning commute as Storm Jake sweeps in.
The Met Office has issued yellow 'be aware' warnings for snow and ice for much of north Wales with up to 5cm expected in many places, rising to 10cm on higher ground.
There is a yellow warning of wind covering south Wales as squally weather arrives from 8am, bringing widespread inland gusts of up to 50mph and coastal gales of 70mph.
The A55 Britannia Bridge and the A477 Cleddau Bridge were closed to high-sided vehicles. There's a 20mph speed limit on the former. One lane's closed on the M48 Severn Bridge in both directions and there's a 40 mph speed limit.
Peak wind gusts overnight (mph): Rep Ireland: Mace Head 83, Shannon 73, Valentia 71. UK: Aberdaron 81, Mumbles 77, Aberporth 73 #StormJake
Due to high winds and the concern for public safety, roads within Aberystwyth town centre are closed.#staysafe
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