Weston & Sampson understands the specific needs of public transportation agencies. To assist these clients, we have built a team of skilled professionals experienced in design, permitting, and construction oversight on highway, bridge, transit, complete streets, and bike/pedestrian trail projects along the East Coast.

Our responsive team of project managers, engineers, scientists, planners, stakeholder engagement experts, project controls experts, and construction oversight professionals is prepared to deliver high-quality projects. We believe that project success is driven by a collaborative, creative, goal-oriented approach to project design and implementation.

Our transportation experts understand the regulatory, budgetary, and public policy issues that are driving the sector today. These issues include an ongoing need to rehabilitate or replace aging public infrastructure; the determination to adapt to climate change through resiliency enhancements and carbon emissions reduction strategies; the desire to increase alternative travel modes including bicycle, pedestrian, and transit facilities; and a growing emphasis on equity, access, and environmental justice.

Transportation officials can trust our interdisciplinary firm to effectively manage schedule, regulatory, and budget risks through our emphasis on safety, quality, client and stakeholder collaboration, creativity, effective communications, and responsiveness.

Weston & Sampson’s comprehensive offerings include:

  • Roadway/Highway Design
  • Bridges & Structures
  • Transportation Planning & Traffic
  • Utility Design & Coordination
  • Site/Civil
  • Buildings/Structures
  • Environmental Permitting & NEPA
  • Stormwater & Drainage
  • Geotechnical
  • Climate Resiliency
  • Stakeholder, Regulatory, & Public Engagement Support
  • Landscape Architecture

News & Highlights

Planning for Trends Shaping the Future of New England Cities - By Joanna Nadeau, AICP, and Susan Mara, AICP Change is a constant, and yet, we plan anyway. Amidst the political and social upheaval of the past decade, planners in New England and elsewhere continue to seek ways to serve the public interest, even as that interest is a moving target. The American Planning Association (APA)’s […]
A rendering showing Curtis Apartments at night with lights on and pedestrians walking on the sidewalks. Trinity Financial’s Vision for the Curtis Apartments Redevelopment - Jessie Johnson's article in High Profile titled, "Revitalizing Great Brook Valley: Trinity Financial’s Vision for the Curtis Apartments Redevelopment," outlines the transformative project.

Contact Our Transportation Experts to learn more about how we can assist your community

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Weston & Sampson’s staff have worked on more than 1,000 miles of roadway in the last 15 years

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We have more than 80 transportation staff along the East Coast

A money icon.

Our staff have worked on more than $500 million (constructed value) of bridges in the last 15 years

Roadway & Highway Design

  • Interstate and expressway design
  • State primary and secondary roadway design
  • Local town and community road design
  • Complete streets
  • Bridge replacements
  • Roundabouts
  • Pavement and pavement foundation analysis and design
  • Rehabilitation and design for new construction
  • Off-ramp design
  • Streetscape enhancements, multi-use pedestrian trails, and linear parks

Bridges & Structures

  • Accelerated bridge construction
  • Culverts and drainage structures
  • Interstate and expressway bridges
  • Local town and community bridges
  • Pedestrian bridges
  • Retaining walls / modular unit walls / sheeting design
  • State primary and secondary route bridges
  • Bridge preservation & rehabilitation

Transportation Planning & Traffic

  • Parking studies
  • Corridor studies
  • Community and statewide master plans
  • Comprehensive development plans
  • Roadway and intersection capacity analysis
  • Signal warrant analysis
  • Signing and pavement marking inventory design
  • Traffic calming studies and design
  • Traffic impact and access studies
  • Traffic monitoring reports
  • Traffic signal design
  • Trip generation studies
  • Work zone traffic management design
  • Safety analysis
  • Alternative impact fee analysis

Utility Design & Utility Coordination

  • Coordination of relocation of all types of utility lines, including overhead & underground electric, signalization, gas, water, sewer, and communications
  • Water line and sewer line relocation design and permitting
  • HDD design of pipelines
  • Geotechnical investigation for trenchless technologies
  • Meter reading modernization
  • Pump Station design
  • Smart grid implementation
  • Utility appraisal & cost responsibility analysis reports and authorization
  • Rail and light rail utility conflict resolution
  • Railroad permitting for utility encroachments
  • Utility conflict analysis
  • Execute utility relocation agreements
  • Utility easement needs determination
  • Environmental impact plans for utilities
  • Utility relocation & construction cost estimates
  • Utility relocation schedules
  • Utility risk analysis & inventory reports
  • EV charging stations


  • Conceptual design
  • Construction management
  • Environmental assessment and remediation
  • Land use planning
  • Landscape architecture
  • Permitting
  • Planning and pre-development support
  • Resource protection
  • Site and infrastructure design and engineering
  • Smart growth and cluster design
  • Parking lot design

Environmental Permitting & NEPA

  • Environmental Assessments (EA)/ Finding of No Significant Impact (FONSI) documents
  • Categorical Exclusion (CE)
  • Minimum Criteria Checklists
  • Community Impact Assessments
  • Indirect & Cumulative Effects Assessments
  • Bicycle & pedestrian planning studies
  • Limited English Proficiency (LEP) Multimodal Planning
  • Permitting
  • Public engagement
  • Visualization

Stormwater & Drainage

  • Roadside drainage
  • Major drainage crossings
  • Pipe, culvert, and channel analysis
  • Retention/detention basins
  • Stream Hydraulics
  • Scour and Stream Channel Erosion Mitigation
  • Watershed Hydrology
  • FEMA Coordination (CLOMR/LOMR)


  • Pavement design
  • Building & bridge foundations
  • Deep and shallow foundations
  • Ground improvement technologies
  • Embankments
  • GRS-IBS design
  • Roadways on dams and dikes
  • Culverts, scour, and revetment design
  • Slope stabilization systems and rehabilitations
  • Retaining wall design
  • Support of excavation wall design and groundwater control
  • Geotechnical instrumentation and monitoring
  • Vibration Monitoring
  • Pipeline boring programs and trenchless technologies
  • Infrastructure design and rehabilitation
  • Utility corridor support

Climate Resiliency

  • Climate modeling
  • Design & adaptation
  • Design guidelines
  • Mitigation & sustainability
  • Municipal vulnerability preparedness
  • Planning
  • Public engagement
  • Risk & vulnerability assessments

Stakeholder, Regulatory, & Public Engagement Support

  • Commitment to inclusion, diversity, equity, and access
  • Data visualization and fact sheets
  • Dynamic multimedia formats including videos, social media, mapping, and webpage content
  • Focus groups and interviews
  • Hosting site walks/tours
  • Identifying stakeholders and building partnerships
  • In-person workshops and open houses
  • Interactive engagement games and coloring pages
  • Online and in-person polling and surveys
  • Print media
  • Synthesizing stakeholder feedback
  • Translation, interpretation, and captioning support
  • Virtual workshops, open houses, webinars, and related technical support
  • Visualization (renderings, flythroughs, etc.)

Landscape Architecture

  • Americans with Disabilities Act (ADA)-related design services
  • Downtown village centers and streetscapes
  • Illustrative graphics & renderings
  • Increased/prioritized safe pedestrian circulation & domains
  • Multi-use trails and greenway systems
  • Parkways and roadways
  • Urban redevelopment
  • Streetscapes