The act, also known as the electronic tolling bill, was signed into law by President Jacob Zuma.
"The president signed the bill into law on Saturday, September 21 before departing for the United States of America to attend the 68th United Nations General Assembly Session"
The announcement was made on Wednesday.
On the same day, Supreme Court of Appeal (SCA) Judge Fritz Brand reserved judgment on whether the tolling of Gauteng's freeways should be reviewed.
The Opposition to Urban Tolling Alliance brought the appeal in its challenge against the SA National Roads Agency Limited (Sanral), the transport minister, and the Treasury.
Earlier on Thursday, the department of transport welcomed the enactment of the bill.The minister of transport will now attend to the remaining procedural matters related to the implementation process, the ministry said.
These include the publication of final regulations, notices and toll tariffs; and determination of date of commencement.
The minister is required by law to publish her final determination on regulations, notices and toll tariffs at least 30 days before the commencement of tolling.