TRANSPORTATION & TRAFFIC ENGINEERING

Trotter and Associates, Inc. has an excellent resume of transportation related projects. These projects include roadway reconstruction, annual maintenance and rehabilitation programs, and parking lot design. Our team has extensive experience with designing/permitting/constructing new or improved access locations with IDOT and the various county DOT’s.


TAI routinely prepares plans and specifications for large transportation projects such as roadway reconstruction, widening, and resurfacing for municipal clients. TAI also commonly designs site development projects that include use-specific features such as traffic calming devices and environmentally conscious features.


Trotter and Associates, Inc. routinely uses specific designs and features to address the needs of heavy vehicles such as fire trucks, school buses, specialty trucks, and construction equipment. Some of these features include truck bays, reinforced pavement, loading docks and appurtenances for the delivery of bulk storage material. Designs must not only be cost-effective but provide safe and practical turning movements for the intended vehicles.


It is imperative that traffic planning/calming features result in reduced speeds but do not impede the flow of traffic. The design should incorporate the following elements:


  • Ensure Pedestrian Safety
  • Separate vehicles and pedestrians



  • Provide increased visibility for pedestrians and drivers
  • Site lines
  • Appropriate lighting
  • Minimize obstructions


  • Maintain vehicle circulation
  • Separate through vehicles and loading areas
  • Minimize intersections and turning movements
  • Provide multiple points of ingress/egress
  • Separate vehicles by type and use


  • Limit vehicle speeds
  • Provide proper signage
  • Pavement marking and delineations
  • Long radius curves
  • Elimination of short cuts


The TAI team has incorporated ecological enhancements within our site designs. These include the use of best management practices such as permeable pavers, pervious concrete pavements, native vegetated bio-swales, rain gardens, bio-retention basins, natural buffers and infiltration beds. These green engineering features help reduce the impacts of pavement and impervious areas on the surrounding environment. In addition, these environmental friendly features can also reduce annual costs by eliminating the routine maintenance associated with asphalt and storm sewer systems.

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RELATED PROJECTS

By m.dupree 09 Aug, 2022
The City of McHenry elected to take significant steps towards improving the local city streets through a road resurfacing program that will continue through the upcoming years. McHenry utilized an independent 3 rd party firm to create a report analyzing the condition of the local city streets for a systematic approach to providing value to the community. This report identified for selection the streets rated the lowest in overall condition. The City made selections based on a dedicated funding amount with the express goal of resurfacing as many roads as possible. The 2022 Road Program included milling of existing bituminous surfaces, preparation and re-grading of the existing roadway bases, adjustment of utility structures, placement of hot-mix asphalt binder and surface courses and the restoration of disturbed areas. The Project incorporated 28 individual streets totaling approximately 7.7 miles of local city streets.  The City requested Trotter and Associated Inc. to provide construction engineering services for the Project. TAI staff provided Project oversite during construction including the Contractor’s daily progress and Work in accordance with IDOT documentation policies and procedures, ensuring the Contractor performed all Work conforming to the Contract Documents, Project coordination between the Public Works Department and the Contractor, documenting construction progress for periodic reporting and quantifying Work performed for periodic payments to the Contractor.
By m.dupree 29 May, 2019
US Route 20 is a two-lane rural highway through Northeastern Illinois that curves through the Pingree Grove town center area on a...
By m.dupree 13 Oct, 2017
TAI completed Plans, Specifications and Estimates (PS&E’s) and performed construction observation for the Warren Avenue water main extension project. TAI designed a...
By m.dupree 13 Oct, 2017
Trotter and Associates Inc. (TAI) completed Plans, Specifications, Estimates (PS&E’s) and secured the IEPA Permits as well as performed construction observation for...
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