Portishead say the Portbury Hundred (A369) from J19 of the M5 to Portishead will remain closed "for a number of hours" following an incident this morning in which a man died.
Avon and Somerset Constabulary say diversions are in place and they are asking motorists to use alternative routes.
We thank anyone affected for their patience and understanding.
The inquest into the driver fatally shot by police, after reports of him waving a gun on the M5, opened today.
Spencer Ashworth whose last known address was in Portishead was shot by firearms officers on the A369 Portbury Hundred on Wednesday morning.
Police say a man died this morning in an incident involving police firearms on The A369. The incident is under investigation by the IPCC.