To pass Exeter, through traffic can join the M5 motorway for three miles. West of Exeter, the A30 is dual carriageway through Devon and into Cornwall, bypassing Whiddon Down, Okehampton and Launceston. The dual carriageway continues through Cornwall to Carland Cross, after which there is a single carriageway stretch to Chiverton Cross. Highways England are currently progressing plans to dual this section of carriageway. A Preferred Route Announcement was made July 2017 and a Development Consent Order was made in February 2020 by Secretary of State for Transport. Construction is due to start in 2020, with the road open to traffic by the end of 2023.