WATCH: Vehicle go-slow on the N3 disrupts traffic

It's believed those making their way to the COSATU-led demonstration against high fuel costs - are moving at a snail's pace along busy the route.  

The union's planning on holding a picket at the Marianhill Toll Plaza later.  

At the same time, members from Durban will be making their way onto the N3 Westbound heading towards the toll plaza.  

ALSO READ: Cosatu to protest over fuel price hikes

The RTI's Zinhle Mngomezulu says officials have been deployed and are monitoring the go-slow.

"We have protesters blocking the freeway on the N3, Southbound, at Market Road. We were made to understand that they are going to proceed to Mariannhill Toll Plaza. To our surprise, they're moving slowly and there's a build up of traffic behind them," Mngomezulu said.