Johannesburg - The existing gantries on the highways are only the first phase of the e-tolling project, DA Gauteng premier candidate Mmusi Maimane said on Tuesday.
He said the SA National Roads Agency Ltd (Sanral) intended to put up more gantries and extend e-tolling.
"It is expected that at least 300km of the province's highways will be tolled in phase two of the project," Maimane told reporters in Johannesburg.
"It is likely that this will be pushed through in the same manner as the existing phase, without proper consultation and at great expense."
Maimane urged Gauteng residents to make their vote count next year against e-tolling.
"The battle is on right now and the secondary phase of that [battle for the Democratic Alliance] is through the vote and ultimately the prospect of being in government," he said.
"I encourage everyone to take their opposition to the ballot box next year. Their vote will determine the trajectory of tolling in this province."
Maimane said a DA-led government would hold a referendum on e-tolling in the province.
"Residents would be able to vote whether they want tolling or not."