Temporary traffic lights are causing delays for rush hour commuters in Ascot Road.
National Grid gas works at the M4 flyover bridge started on Wednesday last week.
The gas works are expected to continue until Tuesday, January 29.
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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.