Use of Graphics and Symbols on Dynamic Message Signs

This project has taken a step toward defining how graphic and symbol displays can improve or assist communication with drivers. Through three human factors evaluations of alternative designs, researchers identified specific design elements that should or should not be used in graphic displays. Additionally, some of the key benefits identified for the use of graphic displays as compared to equivalent text messages are:

– A graphic display appears to improve the ability of drivers to identify available lanes in a problem area.

– The delivery of incident descriptor information (e.g. accidents or work zones) through the use of graphic symbols improves comprehension levels of non-native-language drivers (e.g., a driver whose primary language is Spanish)

– The viewing time required for comprehension by a non-native speaker may be shortened as a result of the use of graphics and symbols.

– The use of graphics makes it possible to effectively illustrate unusual operational scenarios, such as high-occupancy vehicle lanes or adjacent toll lanes, through graphic representation of roadway geometry, logos, shields, etc.