December 14, 2016 / Survey, Traffic, Transportation



This project was to mitigate weaving conditions occurring on the I-17 freeway as traffic approached the I-10 freeway to freeway exit ramps.  The project was completed in three phases.  For the first phase, CK performed was an extensive traffic analysis and traffic simulation analysis modeling driver behavior on the freeway to replicate field conditions. The model included determining the location to terminate the HOV lane on I-17. There were no guidelines at the time for HOV terminations at fully direction interchanges which had significant impacts to the weaving problems. Using this as a base, CK proposed field modifications to signing, HOV termination location and ramp development modifications resulting in reduction of weaving and crash conditions on I-17.

Following approval of the CK Traffic Study, ADOT commissioned CK to prepare design plans for the proposed improvements which included freeway widening, signage and striping modifications, and ITS improvements including FMS conduit relocation and redesign.  The project plans were prepared in accordance with ADOT standards and specifications, including detailed cost estimation and development of project specifications.  Design included redesign of 2 freeway sign bridge structures, HOV lane modifications, 2 ramp gore exit redesign, ITS improvements, detailed traffic control and construction phasing plans. Other project components included detailed topographic surveys, setting of survey control for the project area and development of as-built plans.

Lastly, CK worked hand in hand with the ADOT contractor during the construction phase of the project.  During construction CK performed post design service tasks including attending weekly construction meetings, shop drawing reviews, responding to contractor RFIs, providing assistance as required to the ADOT Resident Engineer, and participating in the project Partnering process.

The I-17 and I-10 interchange is a gateway into the Phoenix Downtown, as such, care was paramount to ensure minimal disruption to traffic during the project construction.


  • Due to the success of this project, CK and the contractor was recognized by the state with the “Partnering Excellence” award for the project.