How supplementary sign features can improve traffic safety among motorcyclists? The effect of capitalization and information length on road sign comprehension.

Objectives: Supplementary signs are essential to improve riders' understanding of road signs. In order to attract the rider's attention and ensure the information on the supplementary sign is effectively delivered, a study on the effective ways to display the information in the supplementary sign is needed. The current study examined the effects of capitalization and information length in supplementary signs on road sign comprehension among riders.