UPDATE

All lanes have been reopened but traffic is very slow, with congestion back to junction 21 for Weston-Super-Mare.

TWO lanes of the M5 northbound are closed after a crash involving a motorcycle.

The incident occured between junction 19 A369 for Portishead and junction 18a M49 for Avonmouth/ Hallen around 7:45am.

Traffic is queued all the way back to junction 20 B3133 for Clevedon.

Reports suggest the crash took place in the outside lane of the motorway carriageway.