Police are attending an incident on the A4 this morning near to Marlborough Road in Maidenhead.
A BMW veered off the road and mounted the grass verge at about 8.40am.
It crashed into a signpost, causing it to be knocked down.
The vehicle is in the process of being recovered.
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The Met Office has issued a yellow alert for Windsor and Maidenhead, Slough and Wokingham, warning that rain moving eastwards across the south of the country may turn to snow in some places.