LDG’s Highway Engineering legacy is paved with successful projects of all sizes, from interstates to rural roads. Our success is fueled by our ability to provide innovative solutions for all aspects of highway design that minimize costs, while meeting schedules. Properly evaluating projects early in the design process is critical to determining the most prudent cost-effective design to carry forward and ensure available funds are optimized.


Bridge Design

LDG Bridge Designers have been connecting communities with award-winning bridge replacements, new constructions, and rehabilitation projects since 1989. Our design experience includes vehicular, pedestrian, railroad, equestrian, and aqueduct projects. Our expertise in historic preservation and our ability to deliver context sensitive solutions have established us as leaders.


Bridge Inspection & Maintenance

LDG Bridge Inspectors have extensive experience completing NBIS bridge safety inspections for PennDOT and local municipalities. LDG currently inspects 600+ local bridges within PennDOT Districts 2-0, 3-0, and 10-0. Without missing a deadline, LDG has inspected 5,000+ of bridge structures and completed 730+ load rating analyses since 1989.


Construction Services

LDG Construction Inspectors offer a full range of services on projects of all sizes. We work closely with our clients to tailor the scope of services to meet your needs, budget, and funding requirements. Our network of inspectors throughout Pennsylvania and the Southern Tier of NY allow us to provide responsive coverage and help to deliver your project on time and on budget.


Transportation Services

From Traffic Engineering to Streetscapes and Master Planning, LDG has you covered. LDG is an industry leader in Travel Demand Forecasting and Traffic Simulation Modeling. Our Landscape Architects and recreation design experts work directly with our Transportation Designers to deliver holistic solutions that strengthen communities.


  • Highway
  • Interchanges/Intersections/Ramps
  • State and Interstate Highways
  • Roundabouts
  • Hydraulics & Hydrology/Drainage Design
  • Erosion & Sedimentation Plans/Stormwater Management
  • Traffic Control Plans
  • Right-of-Way Plans
  • Permitting
  • County/Municipal/Private Roadways
  • Welcome Centers
  • Park & Ride

Bridges & Structures

  • Design/Build
  • Grade Separation Structures
  • Bridge Rehabilitation/Widening
  • 3-Dimensional Finite Element Analysis
  • Asset Management & Capital Improvement Planning
  • Bridge Design – Vehicular, Pedestrian, Railroad, Equestrian, Aqueducts
  • Bridge Rehabilitation
  • Bridge Load Rating Analysis
  • Bridge / Sign Safety Inspections
  • Construction Services
  • DEP Permitting
  • NPDES Permitting
  • Erosion & Sedimentation Control Plans
  • Feasibility Studies
  • Flood Studies
  • Geotechnical Investigation
  • Grant / Funding Assistance
  • Highway Design
  • Hydrologic & Hydraulic Studies
  • Preservation & Maintenance Programs
  • Pavement Design
  • Public Involvement
  • Public Utility Commission Coordination
  • Rails-to-Trails
  • Right-of-Way-Plus
  • Sign & Pavement Marketing Design
  • Traffic Control Plans
  • Utility Coordination

Bridge Inspection & maintenance

  • Asset Management
  • Complex Structures
  • Historic Structure Preservation
  • Viaducts & Aqueducts
  • Drainage Structures
  • Railroad Structures
  • Constructability & Construction Engineering
  • Geotechnical


Traffic, Planning, and Communities

  • Travel Demand Modeling, Forecasting
  • Origin-Destination studies
  • Long-Range Planning
  • Comprehensive Plans
  • Land Use Planning
  • Smart Transportation Design
  • Transportation Policy
  • Traffic Simulation Modeling
  • Traffic Signal Design and Timing Optimization
  • Lighting Design
  • HOP Permitting
  • Corridor Analysis
  • Special Use Lanes
  • Complex Intersection Operational Analysis
  • Multimodal Simulation
  • Transit Signal Priority
  • Toll Plaza Operations
  • 2D & 3D Visualization
  • Bicycle/Pedestrian Trails