We studied the widening of approximately five miles of Interstate 10 in Okaloosa County, Florida, from east of the Yellow River to east of State Road 85. This segment serves as a critical east-west corridor for freight traffic, regional and national connectivity, and hurricane evacuation for the Panhandle. The existing four-lane configuration produced heavy congestion, safety concerns from high freight truck volumes, and insufficient capacity for rapid population growth.
Our objective was to expand the highway from four to six lanes by adding one lane in each direction to accommodate current and projected traffic demand, improve flow, and enhance safety. We analyzed existing and future traffic patterns, reviewed environmental impacts, designed roadway geometry, and evaluated drainage systems. Using FDOT standards, we developed two design alternatives differing primarily in lane placement and cross-slope configuration.
After comparing both options, we selected the alternative that adds new lanes to the inside of the highway with a downward cross-slope opposite to the existing configuration. This design minimizes impacts to adjacent properties, maintains existing bridge clearances, reduces construction costs, and lessens environmental impacts. The expansion improves daily commuter travel, strengthens regional connectivity, enhances economic reliability for freight transportation, and preserves the corridor’s function as a primary hurricane evacuation route. By increasing roadway capacity and optimizing geometric design, our project reduces traffic congestion, improves safety, and prepares the corridor for future growth in Northwest Florida.