When it comes to designing a transportation system involving traffic, streets, and highways, safety and efficiency are undeniably among the top priorities. But in today’s economy, the solutions to transportation challenges also need to be affordable. TWM focuses on helping our clients find the best alignment between effectiveness, efficiency, and economy. We strive for solutions that not only work, but also work “smart” and are within budget.


TWM has a well-rounded team providing a full range of design and construction observation services, bringing our clients established relationships with reviewing agencies such as the DOT, DNR / NRC, and USACE. We have designed dozens of miles of state highways and local roadways in the past five years. We have completed traffic studies, held public meetings, negotiated purchase of land, and acquired necessary permits. TWM has designed several roundabouts, thousands of curb ramps, and the first diverging diamond interchange in IL.

Our expertise ranges from designing new alignments, reconstruction, and widening projects on interstates, rural and urban highways, local streets and bridges, bike trails and sidewalks, multi-modal enhancements, to simply assisting municipalities in planning their annual street maintenance programs. Cognizant that our clients always have budgets to meet, we strive for solutions that not only work, but also work smart.

Traffic & Safety

Traffic engineering is a pivotal piece of the puzzle when it comes to supporting new businesses and neighborhoods with appropriate transportation infrastructure to ensure communities are livable and meet all the stakeholders’ needs.

Traffic & Safety

Roadway Design

Our roadway expertise involves designing hundreds of urban and rural miles of roadways including intersection design and realignment, roadway widening and rehabilitation, ADA-compliant pedestrian facilities, right-of-way design, and streetscape design.

Roadway Design

Roadway Bridges

We assist with all phases of a bridge project including project scoping, conceptual planning with alternatives, preliminary design, hydraulics, and bridge layout to meet site constraints, final design and plans, specifications, and estimates.

Roadway Bridges

Trail & Pedestrian Bridges

TWM's engineers have unique expertise in pedestrian bridges and shared-use structures. Many engineers specify a pre-fabricated pedestrian truss that is designed by others, but we have designed custom signature pedestrian bridges for clients.

Trail & Pedestrian Bridges

Bike/Shared-Use Paths

TWM is considered one of the top pedestrian and bikeway trail planning and design firms serving southern Illinois and Missouri. Whether it's for work or play, our trails are designed with aesthetics, functionality, and cost-effectiveness in mind.

Bike/Shared-Use Paths

Pavement Management

Implementing a pavement management system can help clients more efficiently and effectively manage their roadways. We have successfully aided government clients using tools that evaluate and rank pavement in a systematic way to accurately forecast short- and long-term budgets.

Pavement Management

Grant Administration

Clients often need help pursuing grants and funding opportunities for their projects. Our grant experts have the skills and resources to provide guidance throughout the entire process - from identification and preparation, to application and securing funds.

Grant Administration

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Our Work & Projects

Explore some of TWM’s transportation and traffic projects that demonstrate our design expertise, technical knowledge, and comprehensive range of capabilities.

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We Provide Complete Traffic Services

As an experienced transportation engineering firm, we have the capacity and technical expertise to successfully deliver projects at every phase in every community we serve, from preliminary planning through final project implementation. TWM has two PTOEs on staff. Our areas of expertise include:

  • Traffic engineering studies and signal/stop sign warrant analysis

  • Traffic simulation development and interpretation

  • Signal timing, plan development, and field implementation

  • Traffic operations troubleshooting / controller box field adjustments

  • Traffic impact studies/reviews and traffic impact simulations

  • Traffic safety studies

  • Parking lot studies

  • Safe route to school studies

  • Traffic congestion mitigation studies and solutions

  • Project cost and schedule estimation

  • Superstreet analyses and simulations


  • New roads on new alignments

  • Reconstruction

  • Resurfacing

  • Pavement design

  • NEPA/phase I services

  • Drainage and hydraulics

  • Pedestrian solutions

  • Traffic impact studies, warrant analysis, capacity analysis

  • Traffic signal simulation, optimization, synchronization, detection systems

  • Traffic/pedestrian/pushbutton signals, mast arm, and foundation design

  • Traffic counts (manual and video)

  • Intersection geometrics

  • Roundabout design

  • Access justification reports

  • Speed studies

  • Construction observation

  • Grant administration for competitive federal dollars


As a full-service engineering consultant, we provide a broad range of design projects and related services. Besides Transportation and Traffic, we also focus on many other civil and structural services as well as geospatial services. With our depth of capabilities, we can deliver cost-effective solutions to meet any need or challenge.

Our large structural group delivers innovative bridge designs and associated structures that are cost-effective, safe, easily constructible, and durable.

Our land development group provides complete civil engineering services, from conceptual plans to project approval and construction.

Our water infrastructure group is devoted to the protection of our waters, environmental responsibilities, and designing innovative wastewater facilities.

We use specialized tools that accurately evaluate and rank pavement to forecast both short- and long-term budgets for our government clients.

 TWM specializes in handling these kinds of innovative designs, with benefits that expedite schedules, control costs, and allow for greater customization.

Our construction engineering staff ensure that engineering design skills are effectively translated into the actual construction of the project.

We provide robotic video inspections, flow monitoring, sewer testing for new construction, and push camera inspections for any size project.


That’s our company mission and our promise to you. Our success is built upon a solid reputation for getting the job done right. One thing we are particularly proud of is approximately 95% of TWM’s work comes from repeat business. We believe our resolution of challenges sets us apart, and based on our level of repeat business, we think our clients will agree.