Police are appealing for witnesses after a crash left a car on its side on the M4.

A black Honda CR-V overturned after colliding with an unknown vehicle which failed to stop. A silver VW Caddy then collided with the Honda.

The incident happened on the westbound carriageway between junctions 17 and 18 at about 11.10pm on Thursday.

The drivers of the Honda and the VW were subsequently treated at hospital for minor injuries.

Anyone who witnessed the incident, or has dashcam footage, is asked to call 101 providing the call handler with the reference 5219211288.