The busy road was closed between the Bowhouse Roundabout and the Avon Gorge shortly before 8am after a two car crash.
Drivers were being diverted via Linlithgow following the incident, but the route has now been reopened.
A Police Scotland spokesman said emergency services were alerted to the collision shortly before 7.50am.
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One person was taken to hospital with injuries which were not thought to be life-threatening.