The Johannesburg Roads Agency (JRA) has confirmed that there is illegal mining activity taking place near the M2 highway.
The JRA's Mpho Kau says some of the excavations are just three metres from the freeway and could compromise the road infrastructure.
It exposes the layer works of our pavement on the road to external elements, more so when it rains.— Mpho Kau, Acting MD for Johannesburg Roads Agency
According to Kau, metro police are patrolling the area and a task team has been established to find a long-term solution.
Johannesburg City Parks have also been assigned to clear the vegetation in the area, which miners use to evade authorities.
Listen to the full conversation from The Midday Report with Stephen Grootes: