A 10-mile stretch of the M5 motorway has been closed after a body was found on the road.
Gloucestershire Police said the road was shut between junction 11A at Brockworth and junction 12 for Quedgeley.
A spokesman said officers would be at the scene for some hours to "recover the body and establish circumstances".
The closure is likely to cause extensive traffic disruption as motorists seek alternative routes to reach the Midlands and the South West.
Police were called to the scene just after 4am on Wednesday.
Officers said a "serious incident investigation" was underway as the body was recovered.
"Diversions have been put in place but significant disruption is expected this morning and is likely to last for a number of hours while police continues its work at the scene and establishes the circumstances," police said.
"Anyone who may have information but hasn't spoken to police should call 101 and quote incident 34 of 30 October."
Highways England warned rush hour commuters to allow and extra 30 minutes for travel after diversions were put in place.
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