There's one lane closed on the M5 Northbound between junction 17 (A4018 / B4055 Cribbs Causeway) and junction 16 (A38 Aztec West).
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Elizabeth Martin was walking her pet chihuahua on a lead when they were set upon by a wolf-like dog.
Organisers MTV and Plymouth City Council are asking everyone to make sure they plan ahead for a fun, safe and hassle-free event.
It will be a bright start to the day with some showers. There will be a breeze.