The accident in which two Outsuarance pointsmen were killed while travelling to the 702 Walk the Talk on Sunday morning has highlighted the vulnerability of mortocyclists and cyclists, Think Bike Safety Campaign said.

"It is tragic that two fellow bikers, who had made a career out of keeping others safe, were killed in such a senseless accident," spokesperson Dries van der Walt said.

He said it was vital for both motorists and bikers to watch out for each other on the roads to avoid accidents.

"While other road users need to be more vigilant for bicycles and motorcycles, bikers also need to realise that they must adapt their riding style and speed to the prevailing road surface and traffic conditions.

"Motorists often blame the high motorbike accident rate on the riders of bikes, claiming that the majority of bikers ride too fast or negligently, but here we have exactly the opposite — these pointsmen were riding with in the prescripts of the law, dressed in high-visibility clothing at the time of the accident," said van der Walt.

The Think Bike Campaign is aimed at increasing awareness of bike safety among other road users.

Johannesburg emergency services spokesperson Percy Morokane told Sapa earlier on Sunday that a Toyota Yaris driving in the fast lane of the N1 near the Grayston offramp allegedly crashed into the two cyclists at 4am.

The two, aged 26 and 35, were part of a convey of 11 pointsmen travelling to the fun walk.

The accident occurred in the south-bound lane of the highway.

Both men died on the scene. The driver of the Yaris and his passenger escaped with minor bruises.

Police spokesperson Constable Neria Malefetse said the 26-year-old driver had his blood alcohol level tested at the scene and was allegedly four times over the legal limit.

He would appear in the Wynberg Magistrate's Court soon to face charges of culpable homicide.

Meanwhile, two more motorcyclists were involved in separate accidents in Bloubosrand, north of Johannesburg and Brixton on Sunday.

In the Bloubosrand man suffered multiple injuries when he collided with a Corsa bakkie, said Werner Vermaak of ER24.

"He was transported in a stable condition to a nearby hospital for further medical management," he said.

The second accident happened in Brixon when a 33-year-old man lost control of his motorbike, fell off and landed in the middle of the road.

"When paramedics arrived on the scene they found the man lying in the middle lane of the road with multiple injuries to his face and chest.

"The man was stabilized on the scene and transported per ambulance to a nearby hospital for further medical treatment," said Vermaak.