A busy stretch of Interstate 57 in Williamson County is about to become a bit more challenging to drive. Construction is set to begin next week on a lane expansion project. Weather permitting, on July 6, IDOT plans to begin road construction from Old Route 13 in Marion up to Johnston City. IDOT said they will be rebuilding pavement beneath overpasses, but once that’s finished, they’ll continue on with the project. Officials say The entire project stretching from Marion to Mount Vernon will take time. Officials advised motorists to plan ahead. Officials say this project will probably last through October. Officials say this is an estimated $9-million project in Williamson County. However, for the whole project stretching from Williamson to Jefferson county, more construction is set to come.