Division of Design

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The Division of Design (DOD) provides the procedures, policy, standards, guidance, technical assistance, and training needed to facilitate California transportation improvements and system integrity. The Design Program innovates design solutions by:

  • Seeking out and synthesizing information and customer feedback.
  • Causing the adoption of "best practices" and design information to promote safety, statewide consistency, efficiency and quality.
  • Assisting our customers in the application of design information and practices to facilitate the resolution of project development issues.

What's New!

 

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Highway Design Manual 6th Edition Change 12/14/18
Changes include wording to enhance recycling efforts by the contractor, cross section of local roads over/under freeways with no connection, discretionary fixed object clarification, corner sight distance update, figures updated to match text, as well as typographical, spelling, and reference corrections.

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DIB 92, “Single Point Interchange Guidelines,” has been issued as an interchange design guide and is referenced in the Highway Design Manual.  This guide supersedes the guidance issued June 15, 2001 “Single Point Interchange Planning, Design, and Operations Guidelines.”  The following is a summary of updated features:

  • Consistent with the AASHTO “A Policy on Geometric Design of Highways and Streets.”
  • Clarification provided regarding design, operations, and maintenance aspects.
  • Concepts related to pedestrian and bicycle accommodations.
  • Inclusion of various single point interchange photo examples and updated figures.
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Highway Design Manual has been revised with the 6th Edition HDM Change 07/02/18. Changes include: replacing the nomenclature mandatory and advisory standards with boldface and underlined standards, respectively; replacement of Design Exception Fact Sheet with Design Standard Decision Document; replacement of Chapter 7 of the Traffic Manual with Traffic Safety Systems Guidance, replacement of Traffic Liaison with the appropriate Caltrans traffic engineering representative, replacement of metal beam guardrail with guardrail, typographical corrections and Index/Figure reference corrections.

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The diverging diamond interchange (DDI) is proving to be an efficient interchange configuration that can be used on the State highway system in addition to conventional interchange types provided in the Highway Design Manual. The DDI guidance is consistent with the Federal Highway Administration's technical publication, Diverging Diamond Interchange Informational Guide. The following is a summary of key concepts:
  • The primary difference between a DDI and a conventional diamond interchange is the design of ramp terminal intersections.
  • Directional crossover intersections on either side of the DDI divide and transpose the directions of local road traffic between the signalized crossover intersections.
  • DDIs remove left turning traffic between movements to and from the freeway facility at the signalized intersections.
  • DDIs accommodate pedestrians either along a walkway outside the traveled way or on a center walkway in the median.
  • DDIs accommodate bicyclists along a path that alternates between the outside and inside shoulders or along a shared use path within the center walkway.
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DIB 82-06 provides the most current understanding for accessibility in Caltrans public rights-of-way, per our agreement with the Federal Highway Administration. This guidance implements current State and Federal laws and regulations applicable to projects on the State Highway System. This DIB is primarily used as our accessibility design criteria for highways, but it is also used for scoping projects early in the project development process, as well as designing temporary pedestrian access routes during construction.

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Statewide Alerts and Other Information

Contact Information

Physical Address:

California Department of Transportation
Division of Design
1120 N Street
Sacramento, CA 95814

Mailing Address:

California Department of Transportation
Division of Design
MS 28
P. O. Box 942874
Sacramento, CA 94271-0001


General Information:

Design Liaison Phone List

Division of Design Org Chart

 

 

 

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