Roadway Geometric Design in California (IDM-01) Course Outline

Day 1 – Foundations of Geometric Design

Geometric Design Context

  • Planning perspectives
  • General Plan circulation/mobility elements
  • Roadway classifications/Roadway topology
  • Project development flow charts

Design Philosophy

  • Core “anchors”: safety, operations, comfort, equity
  • Moving from motor-centric to multimodal design
  • Balancing safety, mobility, and accessibility

Design Criteria, Standards & Guidance

  • National/Federal:
    • AASHTO: Greenbook, Roadside Design Guide
    • NACTO Urban Street & Bikeway Guides; requests for experimentation
    • NCHRP design research
    • ADA/PROWAG
    • HCM-7 (operations)
  • California:
    • Caltrans HDM (primary guidance)
    • Caltrans Standard Plans & Standard Specifications
    • California 2026 MUTCD
  • Local:
    • APWA “Greenbook,” SPPWC/SSPWC
    • Local public works standards
  • Design Exceptions and Request for Experiment
    • CTCDC, FHWA Approval
  • Examples of Resolving Design Standard Conflicts

Traffic Operations

  • LOS, delay, capacity
  • CEQA VMT requirements 

Day 2 – Roadway Segments and Intersections

Roadway Segment Design

  • Plan view development (layout, scale, annotations, details)
  • Cross sections
  • Profiles & drainage
  • Horizontal and vertical curves
  • Superelevation
  • Roadside design basics (barriers, guardrails, crash cushions)
  • Sight distance
    • Stopping sight distance
    • Passing sight distance
    • Pedestrian & bicyclist-related sight issues 

Intersection Design

  • Types of intersections
  • Turning radii
  • Turn pockets & transitions
  • Curb ramps
  • Driveways
  • Traffic signals
  • Roundabouts
  • Intersection sight distance 

Day 3 – Multimodal Integration, Freeways & Temporary Traffic Control

Bicycle Facility Design

  • Class I – Class IV

Pedestrian Facility Design

  • ADA/PROWAG
  • Sidewalks
  • Crosswalks
  • Curb Ramps

Temporary Traffic Control Design Interchanges

  • Interchange types
  • Ramps and ramp metering

Freeway Design Elements

  • Freeway Mainline Geometry
  • Weaving Sections
  • Merge/Diverge Areas

Group & Individual Exercises with Real World Examples

Several hands-on exercises will be distributed throughout the course. Exercises will require participants to identify controlling criteria, resolve common conflicts, and defend geometric decisions under realistic constraints in addition to being able to compute basic design values