Hurst-Rosche --- Services - Transportation Planning and Engineering - Highways

MARYLAND DEPARTMENT OF TRANSPORTATION
STATE HIGHWAY ADMINISTRATION

TOWSON ROUNDABOUT

This project consisted of the study and design of a roundabout style intersection for Towson at the intersection of York Road, Joppa Road, Dulaney Valley Road, and Allegheny Avenue. The proposed roundabout replaced two existing signalized intersections. The project included the traffic and site analysis for a roundabout at this location, preliminary alternate studies, public displays and meetings, final design including geometrics, special signing and marking, lighting, pedestrian and bicycle considerations, erosion and sediment control, work zone traffic control and landscape design. The project also involved the coordination with the design of the streetscape on York Road from Towsontown Boulevard to the Hecht Company garage on Dulaney Valley Road. Construction of the project was completed in 1998 for $4.3 million.

LOTHIAN ROUNDABOUT
MD 2 / MD 408 / MD 422

This project consisted of the design of a modern roundabout to replace an existing two-way stop controlled intersection. A roundabout was chosen over a signalized intersection because of its greater ability to reduce the types of accidents primarily occurring at this intersection (right angle and left turn). The project included traffic and site analysis, coordination with property owner to provide access for gasoline truck deliveries, signing and pavement design, lighting design, erosion and sediment control design, drainage design, traffic control design and landscape architecture. To aid in reducing the high speeds on this facility (85th percentile speed, 58 MPH), longer splitter islands were used.

Lothian Roundabout Statistics

Libson Roundabout
LISBON ROUNDABOUT
MD 94 / MD144

This project consisted of the design of a modern roundabout to replace an existing two-way stop controlled intersection. This was the first modern roundabout constructed on Maryland State highways. The project involved intensive public involvement including numerous meetings with a citizens committee to monitor the effectiveness of a temporary roundabout and the installation of a permanent roundabout. A roundabout was chosen over a signalized intersection because of its greater ability to reduce the types of accidents primarily occurring at this intersection (right angle and left turn). The project included traffic and site analysis, signing and pavement design, lighting design, erosion and sediment control design, drainage design, traffic control design and landscape architecture.

Lisbon Roundabout Statistics