Excellence in highway design is the hallmark of Mackin Engineering Company's capabilities. From conceptual studies to preliminary engineering to final design, Mackin's highway engineering professionals have designed over one thousand highway and roadway projects, which have collectively resulted in countless miles of transportation improvements across Pennsylvania. This includes new roadways, as well as improvements to the existing transportation network. The scope of these projects has involved small local and rural routes, major urban arterials, and high-speed interstate highways.

Mackin brings full-service capabilities to these assignments, employing a multidisciplinary staff experienced in various transportation concepts and facilities design. Our transportation planners, highway engineers, and support personnel create state-of-the-art highway designs that address modern vehicular mobility concerns.

Clients who have benefited from our services include PennDOT, the PA Turnpike Commission, county public works departments, transit authorities, metropolitan cities, developers and local municipalities. As a result, Mackin's highway specialists have garnered a distinguished record of award-winning designs, and are widely recognized for their innovative contributions to the practice of highway engineering

The comprehensive range of services provided by Mackin's highway design and associated support professionals include:

• Corridor Alignment Studies
• Feasibility Studies
• Horizontal & Vertical Alignment
• Grading & Drainage Design
• Soil Erosion & Sedimentation Control
• Post Construction Stormwater Management
• Permit Application Preparation
• Utility Relocation & Coordination
• Right-of-Way Plans
• Lighting Plans
• Preliminary and Final Roadway Plans
• Street Reconstruction
• Highway Occupancy Permit Plans
• Roadway Reconstruction
• Interchange Design
• Construction Phasing Plans
• Sidewalk and ADA Compliance Design
• Plans, Specifications, & Estimates Package Preparation
• Design Field View Submission Preparation
• Construction Consultation & Shop Drawing Review
• Construction Bid Package Preparation