The $73 million US 15 at Monocacy Boulevard interchange project addressed safety and capacity improvements to mitigate proposed economic development and increased traffic in the area. The interchange project included a four-lane bridge over US 15, ramps with acceleration and deceleration lanes along US 15, and signalized intersections along Monocacy Boulevard at access locations. In addition, as part of the project, Monocacy Boulevard was extended west of US 15 to connect with Thomas Johnson Drive; access from Hayward Road to US 15 was closed and modified as a cul-de-sac and pedestrians and bicyclists now have access to a large section of a new hiker/biker trail on the northside of Monocacy Boulevard.
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