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Mowatt Lane, Prince George's County, Maryland
A. Morton Thomas and Associates (AMT) provided comprehensive planning and design services for the widening and construction of Mowatt Lane from Campus Drive to Knox Road, including the construction of two intersection roundabouts, located on the campus of the University of Maryland, College Park. Services provided included Background and Data Collection, Engineering Alignment Development, Client Coordination, Surveying, Preliminary and Final Design, Storm Drain Design, Utility Relocation Coordination, Permitting, Landscaping, Lighting, Maintenance of Traffic, Signing and Striping, and Erosion and Sediment Control.
Specific project components included:
Background and Data Collection: Gathered background information including existing as-built utility plans for sanitary 
sewer, steam lines, telephone, PEPCO conduits, pole locations, and Washington Gas.
Alignment Development: Developed roadway options including horizontal alignment; vertical alignment to minimize pavement excavation; and typical section segments landscape strip, lane widths, closed section. AMT minimized impacts to the natural environment and surrounding buildings by developing an alignment that would fit within an existing right of way and coordinated with the University of Maryland and City of College Park to design an alignment to meet their desired needs and Master Plan.
Preliminary and Final Design: Prepared preliminary review plans and final construction documents, construction cost estimate, and special provisions.
Selected elements addressed in the design included:
- Roundabout Design: A traffic analysis was conducted to determine the appropriate traffic control, and a roundabout design was recommended and pursued. Design of the roundabouts followed the FHWA Roundabouts Informational Guide and adhered to AASHTO and SHA design criteria.
- Drainage Design and SWM: Prepared drainage area map, determined adequacy of existing facilities, location/size of proposed inlets and culverts for a closed system, and designed required outfall protection. Met significant SWM quantity and quality control requirements through bioretention and CPV design.
- Landscaping: Trees and shrubs were selected for the roadway and the roundabout center for their aesthetics and easy maintenance.
- Lighting: Aesthetically pleasing lighting was provided to accommodate vehicular and pedestrian traffic.
- Maintenance of Traffic: Extensive maintenance of traffic and phasing was required to accommodate pedestrian safety, and maintain a minimum one lane of traffic in each direction.
- Signing and Striping: Signing was a critical issue ensuring pedestrian safety. Pavement markings at the pedestrian crosswalks were developed to provide high visibility for student crossings.
Client Coordination: Maintained continued coordination with the University of Maryland and the City of College Park to discuss the progress of the project and resolve issues affecting design, including coordination of multiple projects under construction and adjacent to the roadway.
Surveying: In house topographic survey was conducted to establish a base mapping for subsequent design. Buried utility data identified by Miss Utility was recovered and all topographic elements were identified. Property research was conducted to identify right of way lines.
Permitting: Expedited permitting was utilized for MDE/COE joint permitting for wetlands adjacent to the project. Erosion and sediment control approval was coordinated through Prince George's County. Prepared Forest Conservation Plan, coordinating with MDNR until the permit was granted.
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