Aldridge Transportation Consultants, (ATC) is a professional service consulting firm specializing in traffic 
engineering and transportation planning.

ATC is proud of its reputation for resolving difficult traffic engineering and transportation planning problems with creative and innovative design solutions.

Our services include:

Traffic Impact Analyses

Traffic Operations Engineering

Traffic Signal Design

Traffic Control Plans

Urban Travel Modeling

Transit Oriented Development

Roadway and Intersection Geometric Design

ATC’s client list is substantial and includes city, county and state governments and numerous private sector developers of major residential, commercial, and shopping center projects.


Aldridge Transportation Consultants, LLC (ATC) is a professional service consulting firm specializing in traffic engineering and transportation planning. 

ATC has prepared over 1500 traffic impact analyses, designed over 100 traffic signal systems, prepared

ATC’s client list is substantial and includes city, county and state governments and numerous private sector developers of major residential, commercial, and shopping center projects. Most projects are technically challenging and ATC is proud of its reputation for resolving difficult traffic engineering and transportation planning problems with creative and innovative design solutions.

The firm was founded in 1991 by John M.W. Aldridge, PE, PTOE, AICP.  John is a Colorado Registered Professional Engineer, a Professional Traffic Operations Engineer, and a member of the American Institute of Certified Planners.
several access management plans, and served in a sub-consultant role to architectural and civil engineering firms for traffic engineering and transportation planning support. John Aldridge has an impressive list of major project accomplishments with responsibility as the lead traffic engineer and/or transportation planner.

ATC is purposely maintained as a small professional service company to provide clients with a “hands-on” approach from a highly experienced professional. We are networked, however, with other professionals in the field of traffic engineering and transportation planning - so no job is too big for us to handle efficiently and in a timely manner.



We prepare our engineering/planning analysis and recommendations using only the latest

We approach each project with the understanding that traffic flow (mobility) and accessibility can function harmoniously if designed properly.  We work tirelessly with the client and the governing jurisdiction to achieve an engineering solution that provides safe, efficient traffic movement on and off the property and that satisfies high standards for mobility on adjacent roadways and intersections.

Aldridge Transportation Consultants, LLC (ATC) is typically hired to prepare traffic impact analyses and engineering design that support access recommendations to major land use development projects. In many instances, developer initiated land use and access plans face stiff opposition from governing jurisdictions and neighboring residential groups. Traffic flow and congestion are usually major issues for reviewing agencies and opposition groups.
system and operational analysis programs/software. Also, we have developed innovative methods that enable interactive response to development and/or system alternates. And, with the advanced technology and systems available today, we can animate simulated traffic movement and project the image on a large screen so that everyone can see how well access and mobility can be integrated and function harmoniously.

ATC is dedicated to serving its products! Revisions, changes, additional meetings, etc. are often required before a project is completed. Even during construction, traffic and access issues may surface that need resolution. ATC is always there to service the product and often at no additional fee.



1082 Chimney Rock Road

Highlands Ranch, Colorado 80126


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