Then deep holes will be drilled into the rock and 20- to 40-foot-long bolts will be installed to “squeeze the rock slabs together as if in a vise,” according to a department statement.

Workers installed a temporary rockfall catchment fence on the mid-slope bench. They used specially modified drills to install rock bolts into the remaining large sandstone blocks.

Traffic could be stopping as crews remove rock along the slope beside southbound lanes of Route 11/15 in Perry County today and Friday, PennDOT announced.

MONTEREY COUNTY, Calif. — Caltrans announced that a rock slope protection project will begin on Monday. The project will start below Highway 1 near the community of Fernwood.

Once a month from October to May, the HDCA goes to Smith Rock State Park. During their trips to the park, the unit takes old bolts out of rock walls and replaces them with new ones, for public safety.