This is the shocking moment an Australian businessman launched a foul-mouthed ''racist'' rant at a female driver in a heated road rage dispute.

Building supplies boss Nick Fenwick had been driving back to his factory when he allegedly turned out of a queue of traffic early, cutting across another lane and causing a hold-up of cars.

The other drivers began honking their horns at him but he is said to have wound down his window and swore at them in Zambales, Philippines, on Tuesday afternoon.

But instead of driving away, one family followed him into the business's car park where he was filmed screaming at the terrified woman motorist - branding her a ''stupid whore'' and telling her to ''speak f***ing English''.

The sweating businessman then continued the outburst repeatedly shouting ''f*** off'' at her and threatening her friend saying ''you touch me one more time I'll knock your f***ing head off''.

He yells at the tearful woman ''call the police and get the f*** out of here'' before screaming ''f***ing touch me again and I'll f***ing...'' before a male steps between him and the woman.

The dispute continues and he appears to grapple with the man and the woman - who claims he throttled her - before they are separated and he again brands the woman a ''stupid whore''.

Several security guards and staff arrived and the family of locals eventually returned to their car and drove out of the Glarfab factory in the Subic district.