Johannesburg - Outa will brief the media on Wednesday on the progress of its appeal against the implementation of e-tolling on Gauteng's highways.
The Opposition to Urban Tolling Alliance (Outa) said it would make an "important announcement" about the future of its legal appeal.
Outa has fought a lengthy court battle to prevent the implementation of e-tolling.
In April, the SA National Roads Agency Limited (Sanral) said it would begin e-tolling on Gauteng roads within two months.
Last April, the High Court in Pretoria granted Outa an interdict approving a full judicial review before electronic tolling could be put into effect.
The interdict prevented Sanral from levying or collecting e-tolls pending the outcome of a review. Sanral and the National Treasury appealed the court order.
In September, the Constitutional Court set aside the interim order and in December, the High Court in Pretoria dismissed Outa's application to scrap e-tolling.
The court granted Outa leave on January 25 to take the matter to the Supreme Court of Appeal in Bloemfontein.
The appeal is expected to be heard in September.