HNTB was responsible for final civil and structural design services for the world’s first fully dynamic variable pricing on 20 miles of I-15. The San Diego Association of Governments’ project constructed the express lanes in the median, widened the current two-lane facility to four lanes and added a moveable barrier.

HNTB developed initial planning studies, performance requirements and a unique algorithm that updates the price at various entry points every three to six minutes based on traffic levels. Further, HNTB helped draft a request for proposals, as well as evaluate, select and negotiate the toll system integrator’s contract.

During implementation, HNTB provided oversight for the toll system design, approved commissioning of the system and reviewed and approved testing.

Three months after the express lanes opened, average daily use increased by nearly 2,500 vehicles. SANDAG plans to build a regional network of 100 miles of toll facilities and express lanes.

  • Unique algorithm solves pricing challenge
  • Average daily use increases by 2,500 vehicles
  • Facility is model for the future

Location: San Diego, CA

Client: San Diego Association of Government