The M4 is closed westbound as emergency services respond to a crash.
Police have shut the carriageway between Junction 17 (Chippenham) and Junction 18 (Bath) following the incident – which happened at around 9am today (Thursday).
In a statement, Wiltshire Police wrote: “There has been a road traffic collision on the M4 between Junction 18 and Leigh Delamere services. 
“Currently all three lanes westbound are closed. Please find alternative routes.”
