Washington State Comprehensive Tolling Study: Final Report – Volume 2: Background Paper #8: Toll Technology Considerations, Opportunities, and Risks 09/02/2006
America's Travel Information Number: Implementation and Operational Guidelines for 511 Services Version 3.0 09/02/2005
Intelligent Transportation Systems (ITS) - Operational Support Contracts - Implementation Plan - Final Report 01/02/2005
Implementing a Standard Evaluation Approach and Standard Measures in 511 Customer Satisfaction Surveys 12/02/2005