THIS is the sickening moment an motorist is caught appearing to pleasure himself while driving on an Irish motorway.

The horrifying mobile phone footage was taken by a truck driver, from inside his cab.

3 A motorist in an orange Renault appears to be pleasuring himself while on a motorway Credit: Deadline News

It shows him pull up alongside an orange Renault Captur.

Inside it the driver appears to have his trousers undone and seems to be performing a sex act on himself.

It is believed the episode took place on the Westlink road in Belfast.

The footage was uploaded to a private Facebook group by local Steven Larmour, who says it was shared with him and he is unsure of the origins.

3 It is believed the episode took place on the Westlink road in Belfast, Northern Ireland Credit: Deadline News

He captioned it: “Just leave this here.”

In the clip the lorry driver says: “Driving on the road there w******”, before labelling the motorist a “dirty b******.”

Social media users reacted with shock to the clip.

One said: “On the Westlink, f****** hell.”

3 Sickening footage was taken by a truck driver from his cab Credit: Deadline News

Another said: “Imagine seeing this.”

Another added: “Literally t****** it off in traffic, no inhibitions then.”

One joked: “Is this the relief road?”

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Another said: "What’s new another w***** on the road.”

The lorry driver also came under a fire with one person commenting: “You’re just as much of a w***** for using your phone.”

The Police Service of Northern Ireland said they could not comment on the video without knowing when it was filmed.