I eventually brought a car up to Cornell and did not need to use taxis, but before hand, I would occasionaly have to take taxis. Cayuga Taxi is one of the few choices for students. The prices are fairly good. The service is very variable depending on what time of day you go and what day of the week too. Weekend nights are tough especially if you are trying to get home from a party; however, usually it isn't too hard. Make sure you put on your seatbelt because some of the drivers tend to drive a tad fast, at least for my taste.
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