Transportation Engineering

LDG’s bridge engineers and designers have been connecting communities with award-winning bridge replacements, new constructions, and rehabilitation projects since 1989. Our experienced team offers a range of services in bridge engineering (including design for small to medium span bridge structures, pedestrian, railroad, equestrian, and aqueduct projects), bridge and covered bridge rehabilitations, and bridge bundling projects. We typically complete 100% of the project with the same design team including the roadway plans, cross sections, hydraulics and permitting, traffic control plans, right-of-way plans and erosion/sediment pollution control plans. This unique structure helps ensure a streamlined and high-quality product.

Our LDG-certified Bridge Safety Inspectors (CBSIs) bring extensive experience, having inspected more than 15,000 bridge structures and 2,300 overhead sign structures, and completed over 1,500 load rating analyses using both conventional and 3D finite element modeling. Our team maintains current industry certifications, including FHWA non-steel tension member training, ensuring every inspection meets the highest professional standards.

We provide end-to-end inspection services, from coordination and fieldwork to reporting, maintenance planning, and client communication. Our capabilities support both emergency repairs and long-term maintenance strategies designed to extend the service life of critical infrastructure. To enhance safety and efficiency, we utilize in-house unmanned aircraft systems (UAS) to minimize disruption during inspections, along with SPRAT-certified inspectors for structures requiring specialized access solutions.

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 while focusing on the client’s objectives, minimizing costs, and meeting schedules. We understand there is often more than one alternative and that construction costs must be weighed against potential benefits. Our ability to deliver full project support from alternative alignment studies through final design and construction inspection/consultation helps us uncover efficiencies and cost-savings opportunities throughout the process. Our design process follows the strict requirements of LDG’s QA/QC policy, which ensures constructible projects of the highest quality.

Larson Design Group offers experience encompassing all phases of traffic engineering and planning services to support the diverse needs of our clients. Our services include data collection, signs/signals/markings, zoning, land use planning/impacts, long-range transportation plans, capacity and safety analysis, a variety of specialty studies, and much more. LDG is an industry leader travel demand forecasting and traffic simulation modeling. We provide state-of-the-art transportation analysis techniques to address challenging issues. Expert staff is fluent in software packages for modeling work including VISSIM, VISUM, TransCAD, SimTraffic, Corsim, Cube Voyager, TP+, and Tranpan.

LDGs cadre of certified construction services staff is dedicated to representing your interests at the construction site. Through a variety of services such as materials testing, schedule coordination, change order management, project documentation, ensuring the work is being performed according to the plans, applicable codes, and specifications, and verifying invoices for payment, we help to ensure the project is completed on time and within budget.