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Towson Roundabout
Maryland Department of Transportation
State Highway Administration
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.
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Lothian Roundabout
MD 2 / MD 408 / MD 422
Maryland Department of Transportation
State Highway Administration
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.
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Lisbon Roundabout
MD 94 / MD144
Maryland Department of Transportation
State Highway Administration
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.
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