1. Rates must be checked against the local fare regulations. Fake taxis almost always charge excessive fare rates that often run far above the normal rates. One should usually ask for the fare before agreeing to a ride.
2. The body of a genuine cab is important: Most taxi cars are liable to focus and perform normally decent duties that include cleaning and engine maintenance. In fact, they must work with regard to their comfort. Use caution since the presence of shuttle buses often leads one to suspect that they are either fakes or poorly maintained taxis.
3. Check the body of the taxis: Are the taxi's windows dirty? Does it have shiny paint? How about well-maintained tires? You ought to avoid those taxis that are clear signs of wear and tear or even damage as they are usually poorly maintained or are into exploitation of the fare rates.
4. What do the seats look like? Are they kept clean and do they remain in their places? Can one see the steering wheel or dashboard buttons? This may also signal the presence of wear and some features looking rather odd. Fake taxis are usually exploited with modification from an early date in order to hide their authenticity, whereas real taxis may not undergo too many major modifications which in themselves change the quality of certain features.