Palmer Engineering is helping move the US 127 Corridor Improvements forward in Russell and Clinton Counties, Kentucky. This transformative 21-mile project enhances safety, connectivity, and mobility through some of the region’s most challenging terrain. Palmer’s expertise in roadway and bridge design helped deliver innovative, context-sensitive solutions—including major crossings over the Cumberland River and Salt Lick Creek—while protecting the area’s natural resources and supporting surrounding communities.

Palmer Engineering led the design of the Graves Road reconstruction and new Double Crossover Diamond Interchange at I-275 in Northern Kentucky, creating safer, smoother travel and better connectivity for the community. Despite the challenges of the COVID-19 pandemic and complex right-of-way issues, the team kept the project moving forward and delivered an innovative solution for this growing corridor. The project earned multiple honors for engineering excellence, including the 2023 ACEC Grand and National Awards and the 2022 ASHE Great Lakes and Bluegrass Awards.

The US 460 Reconstruction Project is one of the most ambitious and technically complex rural highway projects in Kentucky’s history. As lead designer for the Kentucky Transportation Cabinet, Palmer Engineering delivered end-to-end services to complete 9 miles of new four-lane highway from KY 195 to the Virginia state line.

The project has earned top industry honors, including the 2026 ACEC of Kentucky Grand Conceptor Award and a national Grand Award from ACEC. It was one of just eight projects nationwide recognized with a Grand Award at the 2026 Engineering Excellence Awards Gala in Washington, D.C.

The US 641 project in Calloway County, Kentucky, transformed a once high-risk rural corridor into a modern, safer, and more efficient roadway. Spanning more than five miles from the Tennessee state line to south of Murray, the project reconstructed and relocated the route into a four-lane divided highway designed to enhance mobility and reduce traffic conflicts.

By incorporating innovative solutions such as Reduced Conflict U-Turn (RCUT) intersections and carefully navigating environmental and utility constraints, the project delivered measurable results. Within just two years of completion, total and injury crashes dropped by approximately 80%—creating a dramatically safer corridor for more than 6,000 daily users.

Palmer Engineering provided design services for the widening of 5.8 miles of SR-96 in Williamson County, Tennessee, transforming the corridor from a two-lane roadway into a modern five-lane facility designed to improve safety, increase capacity, and reduce congestion in one of Middle Tennessee’s fastest-growing regions. As the first phase of a larger corridor improvement initiative between Franklin and Murfreesboro, the project included roadway and drainage design, traffic signal and control plans, stream relocation design, and new bridges over Mayes Creek and the CSX Railroad. The completed improvements enhance regional mobility while supporting the area’s continued growth and long-term transportation needs.

Palmer Engineering prepared plans for the replacement of the 1930s vintage, 27-span continuous concrete slab bridge that carries US 20 over two lines of Norfolk Southern railroad tracks. The crossing was complicated by a high degree of skew between the railroad lines and the highway, as well as the need for the new bridge to span two additional railroad lines that may be added in the future.