A38 in both directions is blocked, and there are long delays due to an accident near B3271 Liskeard Road. One of the vehicles involved has gone off the road.
Police say the road could be blocked for some time.
More top news
Find out which train services will be affected by the strike - and plan your bank holiday accordingly.
Bob Crampton warns that it will be showery and blustery over the next few days but the sunshine will still get a look in.
Bath centre Sam Burgess has made it into the England squad for the Rugby World Cup just ten months after switching codes.