Use of electronic passenger information signage in transit.

This synthesis describes the various types of market research panels, identifies critical issues that researchers might be aware of when engaging in market research and panel surveys, and provides examples of successful market research panel programs. It provides information about common pitfalls to be avoided and successful techniques to apply that maximize research dollars without jeopardizing the quality of the data or validity of the results. (Author/publisher) This report is available online at http://onlinepubs.trb.org/onlinepubs/tcrp/tcrp_syn_105.pdf