Four trucks were stoned allegedly by striking truck drivers in the East Rand on Wednesday, Ekurhuleni metro police said.

"The striking drivers stoned four trucks which were passing by the Isando Railway Station but there were no injuries caused," said Inspector Mveli Nhlapo.

Nhlapo said police arrived and managed to calm the situation.

He said there were no arrests and the striking drivers left for a picket in central Johannesburg.

Johannesburg metro police spokesperson Senior Superintendent Wayne Minnaar said the drivers were still protesting at the Beyers Naude Square with no violent behaviour reported.

Road Freight Employers' Association (RFEA) said wage negotiations between truck drivers and their employers were continuing on Wednesday afternoon.

The wage talks ended without agreement at 9.45pm on Tuesday, the first day of the strike by about 20 000 drivers, which could see petrol stations run dry.

RFEA's Catherine Larkin denied media reports that there were already fuel shortages in various parts of the country.

"We have been checking with clients, so far we haven't received any fuel shortage reports," she said.

The SA Transport and Allied Workers' Union (Satawu) could not be reached for comment.

Satawu went on a strike over wages at 1am on Tuesday. The union wants a 13 percent pay hike and four months' paid maternity leave with a job guarantee on return to work.

Employers increased their 10.5 percent offer to 11 percent, but revised it downwards when talks failed on Monday.

Similar protests were seen in Durban and Tshwane.