This is the moment a shocked couple bicker over the toned derriere of a young woman travelling on the back of a motorbike on a busy motorway while wearing only underwear on her bottom half.

The incident was filmed on the Izmir-Cesme Motorway in the western Turkish province of Izmir, and was later widely shared on social media.

In the footage, a Turkish couple are heard discussing the derriere of a young woman travelling on the motorway in front of them.

Straddled on the back of a man’s motorbike, the woman appears to only be wearing underwear with a white top, flapping behind her as the couple speeds along the tarmac.

While following the woman on the bike from lane to lane, the man says: “I have never seen such a laidback person in my life.”

He adds: “Are you at the beach, you idiot? What a sight you are!”

While the man’s partner apparently drives and films the woman with her phone, she asks him: “Did you see it (woman’s behind) for the first time, Yunus?”

The spellbound man replies: “No love, it is not the first time I’ve seen it, but what a sight it is, right?”

It is unclear how long the couple followed the half-naked woman on the motorway.