Twelve people have died in less than a week in separate crashes in Britain and Ireland involving vehicles being driven on the wrong side of major roads, with authorities warning that dangerous driving is being encouraged by social media.

Twelve people have been killed in less than a week in separate wrong-way driving crashes in England and Ireland, intensifying concerns over a dangerous...

“There can be no tolerance for this reckless behaviour that we have seen on our roads recently. It must stop,” Irish PM says.