The Alliance of British Drivers say Bristol is the worst city in the UK for motorists.
Some streets in Bristol will be traffic free today as part of an experiment that could see cars banned on a regular basis next year.
Bristol city centre is to be closed to traffic once a month under a new plan announced today by Mayor George Ferguson.
There are delays of 30 minutes on First Great Western trains between Taunton and Bristol Temple Meads due to an earlier signalling problem at Taunton.
It's also causing 30 minute delays between Bristol Temple Meads and Exeter St Davids.
There's slow traffic on the A38 Filton Road at Toronto Road / Monk's Park Avenue in the roadworks area.
Congestion is back to the B4469 Muller Road.
The A48 westbound is partially blocked due to an accident between the A40 (Gloucester) and the A4151 Elton Road (Elton) at Minsterworth.
A vehicle has collided with the central reservation.
One lane is closed and there's slow traffic due to an accident involving three vehicles on the A350 Blandford Road North eastbound between the A35 / B3068 Blandford Road North and the A3049 (Holes Bay North Fire Station Roundabout).
There's slow traffic on the A37 in Lydford due to an accident at the B3153 junction.
In Bristol, there's a traffic light failure on the B4053 Baldwin Street with the junction of Marsh Street in the city centre.
CCTV reporting the lights are not phasing correctly. Sometimes they are on green in all directions at the same time. Engineers are aware.
- UPDATE 06:43: Traffic lights are now working correctly.
There's slow traffic on the M4 eastbound between J20 M5 (Almondsbury Interchange) and J19 M32 (Bristol).
Cameras now show traffic using the new hard shoulder.
There are reports of slow traffic due to an obstruction on the road on the A370 near the B3128 Ashton Road (Failand turn off).
There are delays of up to 25 minutes on First Great Western services between Swindon and Bristol Parkway due to a signalling problem in the Alderton Tunnel.
There is no estimate for normal service.
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.