Deputy president Kgalema Motlanthe is due to brief the media on the controversial Gauteng Freeway Improvement Project on Thursday.
The briefing is scheduled for 9am in Parliament.
Last week, Finance Minister Pravin Gordhan made an unusual appeal to the Constitutional Court in a bid to set aside a high court order halting e-tolling.
According to the Beeld newspaper, the appeal application papers were handed to Chief Justice Mogoeng Mogoeng at the court.
In an affidavit Gordhan said South Africa would have to brace itself for negative international credit ratings.
Essential services to schools, hospitals and roads would be adversely affected if the temporary court order remained in place until a revision process, and the subsequent appeals, were concluded.
Gordhan regarded his request as so urgent that he asked Mogoeng to convene the Constitutional Court during its annual July recess to hear the application.
His chief objection to the interim court order issued by Judge Bill Prinsloo in the High Court in Pretoria on April 28 was that Prinsloo ignored the constitutional principle of separation of powers.
The Opposition to Urban Tolling Alliance (Outa) applied to have e-tolling halted.
The High Court order prevents the SA National Roads Agency Ltd (Sanral) from levying or collecting e-tolls pending the outcome of a judicial review. Sanral CEO Nazir Alli resigned on May 7.
Government spokesman Jimmy Manyi recently said a review would be done of Constitutional Court rulings to assess “the impact of the judgments of the Constitutional Court on the transformation of society”. - Sapa