Motorists returning to Johannesburg from their holidays have been warned to obey the rules of the road, metro police said on Friday.

"Johannesburg metro police will be on full duty on the weekend," said Superintendent Wayne Minnaar.

He warned that police would be setting up road blocks on major roads and freeways into the city.

Motorists were advised to obey speed limits, fasten seatbelts, not to overload their vehicles, watch out for pedestrians and to "share the road".