Works Consulting to determine cluster groupings for seasonal traffic analysis

Statistical approach will feed determination of annualized traffic figures

January 28, 2000 -- Phoenix Arizona -- Lee Engineering, LLC (www.leeengineering.com) announced today that Arizona Department of Transportation (ADOT) selected Works Consulting (www.gisworks.com) to determine the composition of Automatic Traffic Recorder (ATR) cluster groups statewide.

Although ATRs have long been a component of ADOT’s traffic counting program, only recently have there been enough ATRs installed to analyze and group into statistical clusters for factor application on a statistical premise.  Once the clusters are determined, seasonal adjustment factors can be supplied to transportation planning agencies across the state for the determination of Annualized Average Daily Traffic (AADT) values.

This project is the first statistical attempt in 12 years to cluster ADOT’s 70-odd ATR machines.  Prior factor grouping had to be based upon intuition due to the lack of sufficient ATR sites and data history.   The effort reflects ADOT's ongoing determination to provide valid information to support the transportation planning process.

For More Information Contact:

Works Consulting LLC
Tel: 480-813-0570
Fax: 1-866-882-0377
Internet: jbreyer@gisworks.com