Johannesburg - AfriForum's staff have refused to register for e-tags and are urging Gauteng residents to do the same.
"Personnel and representatives of the organisation will not register for the proposed e-toll system, and the civil rights organisation encourages the public to do the same," AfriForum deputy CEO Ernst Roets said in a statement on Friday.
He said the SA National Roads Agency Limited (Sanral) would be forced to rethink the cost-effectiveness of the e-toll system if enough motorists refused to register for it.
On Thursday, the roads agency announced that e-tolling on Gauteng roads would begin in the next two months.
In April last year, the High Court in Pretoria granted the Opposition to Urban Tolling Alliance (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.
In December the High Court in Pretoria dismissed Outa's application to scrap e-tolling.
On January 25, the court granted Outa leave to take the matter to the Supreme Court of Appeal (SCA) in Bloemfontein. The SCA hearing will take place in September.