The Federal Highway Administration is soliciting bids for a road improvement project covering approximately 56.5 miles of roads within the Mojave National Preserve in San Bernardino County, California. The work involves resurfacing, restoration, and rehabilitation on three specified roads, including full-depth reclamation, new pavement, roadway widening, and safety improvements. The estimated budget for this project is between $80 million and $120 million. The project is located in a sensitive natural area with environmental constraints that will impact the construction schedule and operations. Bidders must have prior experience with projects of a similar magnitude.