Taxis are a popular resource for many people who need to travel but do not want to mess with a rental car or owning their own car. Business men and women who make a business out of town and for people who just want a convenient way to get across town use taxi cabs. Many over pay or take their lives into their own hands simply because they do not know the safest way to use this means of transport.
Many taxis are known for representing spontaneous deal that have nothing to do with the fact that what is going on the meter. Note that the meter is your friend, and nothing is fraud besides the meter. If your taxi driver offers to give you a cash discount, you know, he has something up his sleeve.
If the taxi driver appears in running meter, you know that he is gripping some extra money from you. This is a common practice, but you can just request it start the meter and pay only for the time and distance commuting. Otherwise, he may have begun to oppose two hours before he picked you up, and will charge for time and travel that you have not used.