Rosedale Road Intersection Study and Mini-Roundabout Design at General Johnson Road

Municipality of Princeton, County of Mercer, NJ


County of Mercer
640 South Broad Street
Room 304, P.O. Box 8068
Trenton, NJ 08560









NSPE-NJ Mercer Chapter, Engineering Project of the Year, 2022


TPD evaluated traffic conditions at the entrance to a school and a park and developed recommended traffic mitigation measures including a mini roundabout. TPD provided development of construction plans for a mini-roundabout at the Rosedale Road/General Johnson Road intersection. Project included the preparation of construction plans, grade plans, lighting plans, and detour routes using NJDOT highways.

The project was necessitated by an accident where a pedestrian was struck by a car. The Municipality of Princeton and Mercer County agreed to improving safety at the intersection by the installation of a min-roundabout which, by nature of its design, creates lower travelling speeds of vehicles.

Additional crosswalks, lighting, and signage was installed to aid visibility of pedestrians. Additional flashing beacons and transverse rumble strips, along with pavement markings highlighting the existing school presence, were also added to help awareness of pedestrian activity.

Limerick Township, Montgomery County, PA

Service(s): Highway Design. Construction Management and Inspection Services, Traffic Signal & ITS Systems Design & Environmental Services & Permitting
Client(s): Limerick Township

Municipality of Princeton, County of Mercer, NJ

Service(s): Highway Design
Client(s): County of Mercer

East Marlborough Township, Chester County, PA

Service(s): Multimodal, Complete Streets & Mobility Services, Traffic Signal & ITS Systems, Municipal Engineering Services, Highway Design
Client(s): East Marlborough Township