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MD 4 Corridor Study

Location: Calvert & St. Mary's Counties, Maryland Client: Maryland State Highway Administration

JMT performed a Stage I, II, and III project planning study to analyze the potential traffic and environmental impacts of widening a roadway corridor. 

The client requested that JMT undertake a corridor planning study of MD 4 from the MD 2/4 split in Calvert County to MD 235 in St. Mary's County.  The study would analyze options to improve existing traffic capacity and traffic operations, to increase vehicular and pedestrian safety, and to support existing and planned development in the area.  Through this corridor, MD 4 was two lanes wide and included the 7,000 foot long Thomas Johnson Memorial Bridge over the Patuxent River.  Adding to the criticality of the study was a major increase in personnel at the nearby Patuxent Naval Air Station as a result of Department of Defense Base Realignment and Closure (BRAC) shifts.

JMT provided complete environmental and engineering services to complete Stages I, II, and III of the project planning study for the potential improvements of MD 4, including the Thomas Johnson Memorial Bridge.  We also developed several at-grade and grade separated alternatives for the MD 4/MD 235 intersection.

JMT's environmental staff completed an Environmental Assessment involving comparison and analysis of impacts to wetlands; forests; streams; Rare, Threatened & Endangered species; Section 4(f) resources; cultural resources; air quality; noise analysis and mitigation; and socioeconomic resources.  We coordinated closely with resource agencies to ensure concurrence on project documentation as we developed a Conceptual Mitigation Plan for natural environmental impacts associated with potential improvements and completed a FONSI.

JMT's traffic engineers performed a range of services, including travel demand forecasts, calculation of existing average daily traffic and peak hour volumes, completion of traffic counts to supplement client data, and development of no-build and build traffic projections based on the Metropolitan Washington Council of Government's TP+ model.  We analyzed unconventional intersection and interchange designs using VISSIM and SYNCHRO simulation models.  Transportation management plans were prepared to address work zone construction issues.

The proposed alternatives were presented, along with the environmental documentation, at public meetings, workshops and hearings. 

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