These circumstances made accurate mapping essential. Existing conditions severely constrained the proposed design, and the widening had to occur without taking additional right-of-way or replacing existing bridges. Traffic control and construction staging were key design issues, with approximately 84,000 vehicles per day using I-81 through the project area. Additional storm water management facilities Our approach to storm water management made optimal use of existing right-of-way by rehabilitating existing facilities wherever possible and using linear vegetated swales and infiltration trenches as best management practices (BMPs).Pavement repairs specified by the PennDOT maintenance unit.Concrete roadway slab repair, joint repair, and an overlay of the entire project area.An auxiliary lane added in both directions to connect the ramps at the two interchanges, relieving congestion during morning and evening rush hours.PennDOT, District 8-0 retained Erdman Anthony to design the widening of 2.6 miles of existing Interstate 83, improving capacity between its junction with Interstate 81 (Exit 70) and the Mountain Road interchange (Exit 72) in Lower Paxton Township, Dauphin County.Įrdman Anthony’s design has relieved traffic congestion, improved infrastructure conditions, and introduced safety improvements.
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