A replacement bus service is running between Swindon and Gloucester, due to an obstruction on the line between Kemble and Stroud.
Journey times are extended by up to 30 minutes.
There are delays of up to 20 minutes on First Great Western services between Bath Spa and Westbury, and between Bath Spa and Swindon due to a signalling problem at Chippenham.
Delays expected until around 7:00am.
Wimborne Road is closed in both directions due to a serious accident between Tarrant Rushton turnoff and Tarrant Keyneston crossroads.
The accident is outside the Ashley Wood golf club, and the road is likely to remain closed until mid afternoon.
The A4 Bath Road in Chippenham is closed in both directions at the Bridge Roundabout due to an accident involving a pedestrian.
There's queueing traffic on all approaches to the roundabout due to an accident involving a pedestrian.
Two lanes are closed on the M5 in Gloucestershire due to an overturned lorry between J11A A417 ( Brockworth Bypass) and J12 B4008 (Quedgeley/Hardwicke).
Lanes one and two (of three) closed. A lorry has struck a bridge, overturned and shed its load.
The A38 Gloucester Road in Bristol is blocked due to an accident involving a cyclist and a car near Zetland Road. Traffic is slow moving.
All lanes have now opened on the M5 - both northbound and southbound - following an accident between J15 and J14. There is still queueing traffic and congestion.
All lanes are now open on the M5 southbound near Bristol, but the motorway remains closed northbound between J15 and J14 because of an accident.
The M5 is closed northbound, with one lane closed Southbound, between J15 and J14 because of a serious accident.
There's queueing traffic on the M4 eastbound between J20 M5 (Almondsbury Interchange) and J19 M32 (Bristol).