Comprehension of Posted Highway Traffic Signs in Iraq

Level of posted highway traffic signs (HTSs) comprehension by drivers is used to investigate the effectiveness of the posted HTSs in Iraq. Twenty four HTSs, different characteristics of drivers, and survey with questions of short answer and multiple-choice is selected for this aim. The study results show that there is an increase in the driver comprehension process of HTSs with the increasing of his level of education, level of urbanization of his residence and driving daily practice. Inverse relation occurred with the increasing of driver number of accidents. The results of this research show that it is very important to modify some of the HTSs so as to be easy for comprehending by making it more legible and more appropriateness, also it is recommended to educate drivers to raise there ability to understand the meanings of all the HTSs.