The M5 is closed in both directions due to an accident involving a camper van a car between J28 (Cullompton Services) and J29 (Exeter/Honiton).
All southbound traffic is advised to leave at J28 and follow the triangle symbol via the B3181 to rejoin the M5 at J29.
Northbound traffic should leave at J29 and follow the circle symbol, also via the B3181 and rejoin at J28.
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Becky Watts allegedly told a friend that Nathan Matthews, who is on trial for her murder, described how he would kill her in 2013.
Five people have been arrested after clashes between football fans and police before a Swindon - Oxford match on Tuesday night.
Nathan Matthews, the step-brother of Becky Watts, has admitted to killing the teen - but denies he murder her.