Drivers in Botetourt County are talking and asking questions about the bumps jostling drivers on Interstate-81. VDOT tells WFXR News the bumps on the highway were caused by a slab jacking project. VDOT says they are making arrangements with the contractor to resolve the issue. A crew will have to remove the concrete slabs under the pavement and completely repave the highway. They are hoping to fix the concrete slabs and repave in two weeks.