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Development of the Capacity Analysis for Planning of Junctions Tool (CAP-X)

Project Information

Project ID: 
Project Status: 
Start Date: 
Monday, March 7, 2011
End Date: 
Friday, March 30, 2012
FHWA Program: 
TRT Terms: 
Transportation Planning; Transportation; Operations; Geometric Design; Research; Types of Intersections; Highway Traffic Control; Roundabouts
FHWA Discipline: 
Operations, Planning, Design, Safety
Subject Area: 
Planning and Forecasting, Operations and Traffic Management, Design, Highways, Research

Contact Information

First Name: 
Last Name: 
(202) 493-3293
Email Address: 

Project Details

Project Abstract: 

The project will develop a new tool that advances the Alternative Intersections Selection Tool (AIST) to include a new interface, front and back printing for each design worksheet, computer-aided design (CAD) drawn designs, and shared lanes configurations for the conventional intersection. There are three additions that improved from the AIST: (1) The addition of interchanges include diamond, partial cloverleaf, displaced left turn double crossover diamond, and single point. (2) The addition of one lane by two lane and two lane by one lane roundabout configurations with the 2010 Highway Capacity Manual (HCM) capacity equations.(3) The addition of the mini-roundabout model for 50-foot and 75-foot inscribed circle diameter designs.


The key project objectives are:

(1) Upgrade the interface and improve the use of the tool.

(2) Add new innovative interchanges and roundabout designs.

(3) Release the tool.

Partners and Other Sponsor/Managing/Performing Organizations: