This report includes a review of the literature on CMSs, and it documents two experiments aimed at exploring the specific CMS messages that are most likely to influence traveler behavior. The researchers designed the study procedures to fill gaps in existing research and thereby obtain information that could be used for generating a systematic approach to the selection of CMS messaging. The results identify the potential value of different CMS messages as well as circumstances in which multiple messages may be equally valuable to drivers.

This report may be of interest to traffic management center operators, agency leadership, transportation engineers, transportation researchers, and others who share an interest in promoting safe and efficient traffic flow.

Recommended citation: Federal Highway Administration, A Systematic Approach to Selection of CMS Messaging During Nonrecurring Events (Washington, DC: 2024) https://doi.org/10.21949/1521604