The traffic never stops in cairo, so if you plan on getting anywhere by foot, be brave, and find gaps in traffic anywhere. Be advised the ghetto taxis probably dont have the strongest or functional brakes for that matter... Just do it!
There's Three kinds of cabs in Cairo:
The Black and Whites are usually Fiat Lada's, they have black doors and white Fenders. They don't have air conditioning, and they don't have meters. If you're not prepared to haggle out pricing, don't bother.
The White Cabs are usually newer model cars. They have white bodies with a black and white checkered stripe down the side. These have air conditioning and Meters. The Meter spares you the trouble of negotiating and arguing out ricing, and the meters are fair. They calculate based on both time and distance. You usually have to ask the driver to turn on the AC (Takeef), and if it is a short trip they might decline. But for a longer trip or in the heat of the day, they'll usually roll up the windows and be accomodating. You ARE paying after all.
Yellow Cabs are called cabs. You call for them to pick you up. They have AC and Meters and you call a phone number to have one dispatched to where you are. These tend to be more expensive, but in a situation like getting to Ramses Station or the Airport with your luggage, they're pretty handy.
There's a new thing called the London Taxi. They only operate on a call basis, will pick you up at your hotel and will only take you to the airport. These are more like limos, larger cars, with lots of options. The pricing is pre-set.
If your driver's done a good job? Say they got you where you were going quickly? Tipping is appropriate. We had a guy get us from Mohandeseen to Houssein, and the meter stopped at 17LE. I had expected him to take the October bridge and was planning for closer to 30 LE. I was so impressed I handed him 20 and said my Chukran and left the car. Was worth it to me that he saved me both time and money.
Watch out for the Cairo traffic. The speed limit is roughly 90KPH but nobody inforses nor follows that. Speeding cars are common and do not stop, so be extremely careful!
Try avoiding crossing the main streets because pedestrians crossing does not exits in the Egyptian vocabulary. Cars will never stop for you so be very careful.