Johannesburg - Cosatu has not been granted permission for a planned protest against e-tolls on Johannesburg highways, metro police said on Thursday.
"Permission has not been granted because with the previous motorcade protest, protesters had stopped on the freeway and walked on the freeway which is a contravention of the National Road Traffic Act," said Chief Superintendent Wayne Minnaar.
All law enforcement agencies would be on standby to ensure the protest did not go ahead on Friday, he said.
On Tuesday, Congress of SA Trade Unions (Cosatu) Gauteng secretary Dumisani Dakile told reporters in Johannesburg that Cosatu and its partners would embark on a go-slow drive, and a march to bring the province's highways to a standstill.
The first protest would be on the M1 north, N1 south, N12, and M2 north highways in Johannesburg on Friday.
In December, the N3 highway was briefly closed when protesting motorists parked their cars sideways and started dancing on the road during a "drive-slow" motorcade.
Police spoke to the protesters and the motorcade began slowly moving again.
However, some people remained on the highway and continued dancing.
A group of impromptu protesters closed the N12 near Soweto when they left their cars to sing and dance beneath a gantry.
The demonstration ended disrupted when police had a tow-truck remove a vehicle parked in front of them.