Thought Leadership

Diverging Diamond Interchanges (DDI): Point/Counterpoint Analysis

Author:  Brian Toombs, PE

The Federal Highway Administration (FHWA) advocates innovative intersection designs such as the Diverging Diamond Interchange (DDI) to promote safety, increase capacity, decrease congestion and minimize the cost of new infrastructure.

DDIs are catching on across the U.S., but concerns still exist about this new type of interchange. Is a DDI the right solution for all transportation systems? Check out this Point/Counterpoint analysis for B&N’s insight into common perceptions about a DDI.

TOPICS INCLUDE:
  • Driver Expectation and Interchange Geometry
  • Evaluation of a Location and Reduction of Crashes
  • Accommodations for Pedestrians and Bicyclists
  • Low and High Speed Facilities
  • Thorough Interchange Analysis