The Taxi Challenge is to see who knows the San Andreas Map best. To take the challenge, You need to go to the options and disable your radar and blips. Then, Get a Taxi or Cabbie and go to Grove Street (Los Santos), the Doherty Garage (San Fierro) or the Four Dragons Casino (Las Venturas) and begin the Taxi Driver missions. The winner is decided by whoever can do 50 fares in each city. Video recording is required. Do not cheat by editing out parts where you paused and checked the map.
I managed 25 fares. I got to 25 fares and totaled the Cab forcing me to quit. I got the Burger Shot several times which meant going to both locations. Often times it was the other Burger Shot.
I hope to see this catch on and become a popular thing.