No meters. You're meant to know how much a journey costs, and if you don't, you'll get ripped off. Also, be sure to memorise the numbers in Arabic from 1 to 10, so that you can haggle more effectively.
The rough rule of thumb for knowing how much a certain journey should cost - roughly, a trip from Zamalek to Tahrir would be about 5 Egyptian pounds. This isn't a long journey and takes maybe 10 minutes, depending on traffic. 5 Egyptian pounds is about 50 pence. Longer journeys, especially to tourist destinations, will always give inflated prices, but try to haggle them down. You can also pre-agree the prices for longer journeys, but it's trickier for quicker inner-city taxi rides.
Further, when you get a taxi from the airport, it's very important to disregard the first couple of drivers who offer you their taxi, so that you build some credibility. 50 Egyptian pounds isn't that bad, especially for westerners just arriving, to get a taxi to your hotel in the city, but if you can get it lower, so much the better. The reason it's more expensive from the airport isn't just the distance (it's maybe forty minutes) but also the fact that the taxi driver has to pay a couple of entry fees and bribes in order to be inside the airport area at all.
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