A woman was fatally hit by a van after she chased her dog on to a motorway, police believe.
The 66-year-old was pronounced dead at the scene after being struck on the M4 near Cardiff by a Ford Transit at around 6.15pm on Friday, officers said.
South Wales Police believe she followed her dog after it ran into the road. The force appealed for witnesses to come forward.
The family of the victim, who had been driving a white Volkswagen Golf, has been informed.
The motorway was closed for five hours while police investigated.
Anyone with information should contact 101.