Many drivers get frustrated at road closures - but now, police have spoken out about why they may be necessary after crashes.

Dorset Police have teamed up with colleagues in Devon and Cornwall to produce the video, which they shared on their Twitter account.

The video features Chief inspector Adrian Leisk, of the Alliance Operations Department, who explains that road closures after fatal crashes are necessary so officers can piece together evidence at the scene of collision to understand what happened.

The video was put before a non-injury incident on the A338 Spur Road in Bournemouth on Wednesday, which caused gridlock across the area for nearly five hours.

The crash involved a trailer carrying a portable toilet and it led to a public backlash over the congestion which lasted until mid-evening.