Human remains have been found near the busy A404 slip road in High Wycombe, Buckinghamshire.
Thames Valley Police officers discovered the remains at the roadside during a routine patrol near Handy Cross roundabout at about 1.40pm on Saturday.
The road was still closed on Sunday and is expected to remain shut until Monday.
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Thames Valley Police said the death is being treated as unexplained.
The slip road feeds onto the M40 northbound and commuters could encounter rush hour delays on Monday morning.