Here's a great article on the biggest car service in Brooklyn-- Arecibo (their base station is around the corner from where I live). Many interesting details about the economics, technology, and politics of the livery business in NYC:
From a safety perspective, in NYC it's illegal (and not a good idea) to hail a non-yellow-medallioned taxi on the street. They likely don't have a TLC license, and may or may not be affiliated with a larger fleet.
Call the service's base station--they might not perform background checks on the drivers, but they'll be licensed and insured. The services have an incentive to weed out the bad drivers-- if they get a reputation for spotty service or creepy guys, then customers will switch to the car service down the block (there is healthy competition in this market-- they are constantly splitting off and trying to poach each others' drivers).
http://nymag.com/print/?/news/features/54678/
From a safety perspective, in NYC it's illegal (and not a good idea) to hail a non-yellow-medallioned taxi on the street. They likely don't have a TLC license, and may or may not be affiliated with a larger fleet.
Call the service's base station--they might not perform background checks on the drivers, but they'll be licensed and insured. The services have an incentive to weed out the bad drivers-- if they get a reputation for spotty service or creepy guys, then customers will switch to the car service down the block (there is healthy competition in this market-- they are constantly splitting off and trying to poach each others' drivers).