1. Characteristics of drivers understanding of posted signs;Al-Madani,1995
2. Motorists conception of posted regulatory and warning signs/;Al-Madani,1996
3. Influence of drivers comprehension of posted signs on their safety related characteristics;Al-Madani;Accident Analysis and Prevention,2000
4. Al-Sharea, A., 1988. Behavior of the drivers and safety measures. 3rd IRF Middle East Conference, Saudi Arabia (in Arabic).
5. Investigation of traffic signs to improve road safety.;Al-Yousifi,1999