One lane is now closed on the M25, clockwise, on the exit slip road with slow traffic due to a broken down vehicle at J30 A13 Lakeside / Tilbury.
Normal service has resumed on Eurotunnel trains out of Folkestone after an incident with trespassers in the tunnel.
There are delays of up to 30 minutes on CrossCountry trains between Southampton Central and Brockenhurst due to a signalling problem at Redbridge.
First Great Western and South West Trains services are also affected. It is hoped that a normal service will resume from around 6.30pm.
There's currently three separate incidents causing hold-ups on the M4 in Berkshire and Wiltshire - westbound between J4B M25 J15 and J7 A4 Slough West, between J6 A355 Slough / Windsor and J7 A4 Slough West, and eastbound between J17 A350 / A429 / B4122 Chippenham and J16 A3102 / B4005 Swindon West.
Meanwhile traffic is very slow on the M25 clockwise from J30 A13 Lakeside / Tilbury to A282 QE2 Bridge / Dartford river crossing.
There's a waiting time of up to three hours on the Eurotunnel service at Folkestone due to earlier trespassers in the tunnel. Freight services are facing a wait of three and a half hours.
The A36 is closed in both directions in Stockton, Wiltshire, with slow traffic due to a serious accident involving a lorry and a car between the A303 and A350 / B3414 Bath Road. A diversion is now in place via the A350 and rejoining the A36 at Warminster.
The A281 in West Sussex is closed in both directions with queueing traffic due to a fallen tree between the A272 Cowfold and Picts Lane, Crabtree. The emergency services confirm delays on the A272 approaching the restrictions.
There's queueing traffic on the M20 coastbound on the exit slip at J11A Channel Tunnel. Eurotunnel have delays of up to three hours after problems in the tunnel.
There are delays on the M3 in Hampshire. One lane is closed and there's slow traffic after an accident on M3 Northbound between J9 A34 (Winnal Roundabout) and J8 A30 / A303 (Andover). Average speed ten mph. Travel time is 60 minutes.
In Gillingham, the A289 Pier Road is blocked at Gillingham Gate Road.