Burrington Combe is partially blocked due to an accident.
Two vehicles involved between Ellick Road (Blagdon) and Ham Link / Link Lane (Burrington).
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A survey of more than 3,000 dog-owners across the country was carried out by the RSPCA.
Avon and Somerset Police say the incident happened between 8am and 8.30am on Friday, 15 September on Hollywood Road in Brislington.
Prosecutors say the group made at least 18 drug deliveries to Gloucester from the Midlands before being caught.