State Route 156 & Castroville Blvd.

Castroville / Monterey County, CA


The TAMC/Caltrans-led project provided roundabout solutions for the new interchange at SR 156 & Castroville Blvd. that serves this growing area in Monterey County, CA.


MTJ provided roundabout design optimization/peer review support that included:

  • Rodel operational analysis
  • Highly developed concept designs
  • Documentation of designs and modifications
  • Application of appropriate traffic and roadway design principles (system considerations)

MTJ’s design optimization/peer review approach ensured:

  • Adherence to roadway and roundabout design principles
  • State-of-the-practice roundabout design techniques
  • Safety: Ensure safety for all modes – peds, bicycles, vehicles
  • Application of FHWA Performance Checks (NCHRP Report 672)

MTJ also applied best practices to conform to NCHRP Report 834, Crossing Solutions at Roundabouts and Channelized Turn Lanes, and PROWAG, Public Rights-of-Way Accessibility Guidelines.


  • 2-roundabout design for new interchange
  • Adherence to roadway and roundabout design principles
  • Rodel operational analysis for proper laneage
  • State-of-the-art roundabout design principles
  • Accommodation of large trucks/freight

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