1. Characteristics of drivers' understanding of posted signs;Al-Madani,1995
2. Influence of drivers' comprehension of posted signs on their safety related characteristics;Al-Madani;Accident Analysis and Prevention,2000
3. Behavior of the drivers and safety measures (Arabic);Al-Sharea,1988
4. Recognition errors among highway signs;Avent;Transportation Research Record,1986
5. Is driver training contributing enough towards road safety;Brown,1988