Unless you want an anxiety attack, it is preferred you not drive in Cairo. The drivers are very careless and traffic signals are suggestions instead of actual rules. However, if you insist on taking on this experience, try observing the locals driving habits and then take the plunge if you dare.
Traffic in Cairo is heavy all day long and beeping horns are a constant sound. During the night, few drivers use lights and if they do, they blink them as a way to signal other drivers to get out of the way.