Adding graphics to dynamic message sign messages

Authors

Jyh Hone Wang, University of Rhode Island
Siamak G. Hesar, Stevens Institute of Technology
Charles E. Collyer, University of Rhode Island

Document Type

Article

Date of Original Version

12-1-2007

Abstract

A human factors study assessed the effects of adding graphics to dynamic message sign (DMS) messages. Two approaches employed in the assessment - a questionnaire survey and a video-based driving simulation experiment - are reported here along with the findings. The questionnaire surveyed drivers' preferences concerning the addition of graphics to a text message, the color of the message, alternative graphic images, placement of the graphic image, image contrast, flashing, and the framing of graphic images. One hundred and twenty-seven subjects from Rhode Island participated in the survey. Statistical analysis of survey results showed strong preference for graphic-aided messages over text-only messages; amber-color messages over green- and red-color messages; and messages with graphic on the left side over others. The analysis also identified specific graphics to accompany certain text messages. Based on the survey results, a video-based driving simulation experiment was designed to test drivers' responses to selected DMS messages surveyed in the questionnaire. Forty-eight subjects from different age groups with different native language backgrounds took part in the experiment Results of the experiment showed that graphic-aided messages displayed in amber or green were responded to significantly faster than other settings. Older drivers' responses were slower and less accurate than others; however, their responses improved significantly when the DMS messages were enhanced by graphics. It was also found that graphic-aided DMS messages helped improve the responses of non-native-English- speaking drivers.

Publication Title, e.g., Journal

Transportation Research Record

Issue

2018

Citation/Publisher Attribution

Wang, Jyh Hone, Siamak G. Hesar, and Charles E. Collyer. "Adding graphics to dynamic message sign messages." Transportation Research Record 2018 (2007): 63-71. doi: 10.3141/2018-09.