A driver was cut out of their car after a crash on the M4 between junction 8/9 and 10 westbound last night.
The fire service say the Mercedes driver was taken to Royal Berkshire Hospital in Reading with chest injuries and breathing problems after a collision with a BMW and Volkswagen Golf just before 11pm.
Crews from Slough and Windsor attended the scene.
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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.