Some petrol stations across the country have run dry as a strike in the road freight industry enters its third day, the Fuel Retailers Association said on Thursday.

CEO Reggie Sibiya could not say how many petrol stations had been affected, but added that most complaints had been received from Shell and Chevron.

Other members of the association, such as BP, Engen and Sasol, "have had no issues so far."

The areas most affected were in Witbank, Pretoria and Durban.

"Easter doesn't make it any easier," said Sibiya, as many motorists prepare to go on holiday over the long weekend.

Sibiya said that the impact of the road freight strike by the SA Transport and Allied Workers Union members had only been felt on Thursday as most petrol stations had a lead time of two days.

More petrol stations are expected to run out of petrol by midday, if there are no deliveries, he said.

The strike in the road freight industry started on Tuesday and continued on Thursday, even after an agreement had been reached on wage issues.

Satawu is now demanding that the wage agreement be extended to employees not covered by the bargaining council, such as data capturers and administration staff, Magretia Brown of the Road Freight Employer's Association confirmed.

No talks were scheduled for Thursday and the strike would continue "indefinitely", Brown said.

"The RFEA categorically condemns the violence and intimidation that has accompanied the industrial action," she added.