Why is Joburg's N1 highway warping?
Johannesburg - The Democratic Alliance wants Roads and Transport MEC Ismail Vadi to explain why newly laid tar on the old concrete highway in Johannesburg is already warping, it said on Friday.
In a letter to Vadi, DA spokesperson Neil Campbell said he had also asked who was going to pay to have it fixed.
The Star reported on Friday that the highway was warping so badly between the Malibongwe and Beyers Naude off-ramps that it would have to be cut up and re-laid.
It reported that the warping was because of movement of the asphalt surfacing on the underlying concrete road.
SA National Roads Agency Limited (Sanral) acting regional manager Willem van der Merwe told the newspaper the road would not have to be re-tarred, but a small strip of asphalt surfacing on the yellow line would have to be milled out and replaced.
Warping was unusual in the industry and tests were being done to identify the problem, he said.
Sanral would then establish who would be responsible for the repair and costs.
The section was part of Sanral’s R20bn toll road network, which road users would soon have to pay 40c/km to use.
In a statement, Campbell said the rapid deterioration of the new road surface was "deeply concerning" and could be a danger to motorists.
An investigation into the reasons for the failure and the cost implications had to take place immediately, he said.
"The public needs the assurance that the tar over the ultra-thin pavement system used to underpin the widened sections of roads will not be similarly affected."