A reinforced concrete buttress was being installed. Pic: SGCT.
Engineers and contractors involved in stabilising a rock face in Shropshire, which has closed a road, say they need another three weeks to finish the work.
Jiggers Bank, a major road into the Ironbridge Gorge, has been shut since the start of June, so rocks near the top of the bank can be made safe.
The road is scheduled to reopen on Monday, 11 August.
The road is closed from the junction with Cherry Tree Hill to the A4169 Ironbridge bypass.
Road diversions remain in place.
The Severn Gorge Countryside Trust (SGCT), which has a lease on the site from Telford and Wrekin Council, said installing a large reinforced concrete buttress has been a "really complicated job".
Manager Russell Rowley added: "If you imagine a rockery in your garden with the big rocks at the bottom and the soil at the top, what's happened at Jiggers Bank is it's upside down.
"You've got the soil at the bottom and the rocks at the top.
"If you can imagine how unstable that is, it's a big sandstone block with a load of soil and clay at the bottom.
"Over the years that's eroded due to freeze thaw action, where water freezes in a crack and expands it, and the action of sun and rain."
Contractors Can Ltd has been carrying out the work with Scott Wilson Ltd doing the project management and design work.