Engineering Design Source, Inc.

16141 Swingley Ridge Rd
Chesterfield, MO 63017
Phone: 636.537.5585

Traffic Studies & Signal Design

EDSI provides a full range of traffic engineering services including the design of new traffic signals, traffic counts, traffic impact studies, traffic modeling and support services for Intelligent Transportation Systems (ITS). We have extensive experience in these areas, and are pre-qualified with MoDOT and IDOT in Traffic Signal design and Traffic Operations.


General Tasks Include:

– Signal Design

– Lighting Design

– Trip Generation and Distribution

– Capacity Analysis and Simulation

– Safety Assessment

– On-Site Circulation Evaluation

– Parking Assessment

– Progression Studies

– Signal Warrant Analysis

– Project Impact and Mitigation

– Intelligent Traffic System (ITS) Support Services

– Americans with Disabilities Act (ADA) Regulations

– Signing

– Pavement Markings


traffic experience

City of St. Louis Board of Public Service Traffic Management

Location: City of St. Louis, Missouri

EDSI was the prime consultant selected to perform machine volume traffic counts to the City of St. Louis. This project included the simultaneous count of fourteen various locations for the duration of seven days in Downtown St. Louis. Hose-type and pad-type counters were utilized. Traffic data that was collected was summarized in one-hour increments and presented numerically and graphically.



I-64 Economic & Regional Mobility Study

Location: St. Louis, Missouri

EDSI was selected as a sub-consultant for on-going study that evaluates, measures and trends the economic and regional mobility impact caused by full lane closures that are deployed as part of the construction effort to improve the New I-64 corridor. Tasks include quarterly roadway segment machine traffic counts, quarterly intersection turning movement traffic counts, monthly/quarterly corridor travel times, other related data collection efforts as needed, and quarterly public interviews. This study continues through 2011.



Loughborough Avenue Traffic Study

Location: I-55 Intersection, St.Louis, Missouri

EDSI was selected as a sub-consultant to analyze the impact of an existing 30-acre multi-use commercial development, coupled with proposed roadway improvements, and a proposed recreation complex to a study area which includes five intersections in the vicinity of the interchange at I-55 and Loughborough Avenue. EDSI’s report included study area and data; three peak-hour manual turning counts at five intersections; exiting, short term, and future scenarios; trip generation and distribution; capacity analysis and simulation; sight distance analysis; and project impacts and mitigation.



Forest Park Access & Circulation Study

Location: St. Louis, Missouri

Forest Park Access Circulation Parking Study

EDSI was selected for project management of the sub-consultant portion of a study to analyze and document conditions and issues, and recommend creative and innovative solutions across all modes of circulation that require a minimum of physical changes within the Park. The intent of the project is to provide a comprehensive study that looks at all modes of transportation… mass transit, automobiles, bicycles, and pedestrians. Primary tasks included generation of base map; field inventory; collect traffic counts; and provide input on various scenarios, evaluation of assumptions, assessment of recommendations, new alternatives, prioritization of improvements, and project documentation.


“Thank you for contributing to this process and making this a successful project.” Shawn Leight, PE, PTOE, PTP



CMAQ Morganford, Lindell, West Florissant & Vandeventer

Location: St. Louis, Missouri

EDSI provided traffic engineering and surveying services as a sub-consultant on four Congestion Mitigation and Air Quality Improvement projects for the City of St. Louis. The goal of these projects was to improve the traffic signal timing, reduce wait times and congestion on several major thoroughfares in St. Louis. EDSI was responsible for completion of the following tasks: existing topographic survey, utility coordination, easement plats, traffic signal construction review, field investigation/equipment preparation, mainline data collection, weekday and weekend data collection, summary of data, signal timing plan development, pre-period travel time measurements, post period travel delay measurements, traffic signal design, preliminary plans for detailed handicap ramp drawings and final PS



Route 100 Widening

Location: Franklin County, Missouri

Route 100

EDSI provided subconsultant plans to widen Route 100 from two lanes, to four lanes, from Route 47 to I-44. The overall project was approximately ten miles roadway widening, grading, drainage and bridge construction extending from Route 46 to Interstate 44. The project was divided into three phase: culvert replacement; Phase I – westerly 1.6 miles of roadway; and Phase 2 – easterly 8.5 miles. Design on phase 2 included traffic signals at four intersections, lighting, and 7800 of interconnect.


“We enjoyed working with EDSI on this project.” Dustin Riechmann, PE, PTOE



Parker Road Traffic Counts

Location: St. Louis County, Missouri

EDSI performed machine volume counts using hose-type and pad-type counters for seven days are four location. The traffic data was summarized in one-hour increments and presented numerically and graphically.


“It was a pleasure working with the EDSI team.” Robert Taylor



I-70 Tri-Level Connection

Location: St. Clair County, Illinois

1-70 Tri Level - IL

EDSI was responsible for the subconsultant portion of construction plans for the Tri-Level Connection project from the tri-level interchange northerly to south of the proposed relocated IL 3 interchange at Packers Avenue for the New Mississippi River Bridge. Design included traffic signal design at 15th Street and Baugh Avenue, traffic signal design at 15th Street and St. Clair Avenue, roadway design of St. Clair Avenue from 15th Street to 10th Street, miscellaneous sewer lining plans, and civil engineering and CAD support for the 15th Street plans.