Traffic is moving slowly on the M4 near Maidenhead after an incident.
Motorists moving eastbound between Junction 8/9 and Junction 7 are experiencing delays to their journey.
According to National Highways, there is currently congestion on the stretch of motoway.
Drivers have been brought down in speed to 40mph while signs are reading "incident".
National Highways have been contacted for comment.
Those who are planning on joining the M25 from the M4 are also being warned of delays due to a broken-down vehicle on the exit slip at J14 A3113 Airport Way (Heathrow).
As a result, there is heavy traffic on M25 clockwise before J15 M4.
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