Preliminary Design of a Pedestrian Culvert Tunnel at Hillside Road and Glenbrook Road This senior design project focuses on the preliminary design of a grade-separated pedestrian crossing at the intersection of Hillside Road and Glenbrook Road on the University of Connecticut Storrs campus. This location experiences heavy pedestrian activity during class change periods, which can interrupt vehicle flow and create potential safety concerns between pedestrians and roadway traffic. The proposed solution is a reinforced concrete box culvert tunnel that would allow pedestrians to travel below the roadway while vehicles continue through the intersection above. The design considers pedestrian safety, ADA accessibility, roadway operations, existing utilities, vertical alignment constraints, drainage, waterproofing, and constructability. A major part of the project involved balancing the depth of the tunnel, the available ramp lengths, the need for accessible slopes, and the existing underground infrastructure near the project site. The final concept provides a practical and accessible pedestrian tunnel layout intended to reduce pedestrian-vehicle conflicts, improve traffic flow, and enhance overall campus mobility. The project represents a preliminary engineering design that combines structural, geotechnical, transportation, and site layout considerations into one coordinated campus infrastructure improvement.