Roman's Taxi Driver is a side mission featured in Grand Theft Auto IV, that requires the player to drive passengers to specific locations within a time limit for a cash reward.
Niko can perform the taxi side mission, after the mission Jamaican Heat, by phoning Roman Bellic and choosing the "Job" option on the menu. Roman will give the location of the customer and his/her destination as well as informing Niko to pick up a Taxi from the cab depot. If Niko is already driving one, he will tell Roman that he can go and pick up the fare immediately.
Even though no time counter appears, the passengers will tell Niko to hurry up and the mission can fail if the player takes too long. However, most fares give Niko ample time to reach the destination, though the player can still be held up at places like Tollbooths.
After the player completes all ten Roman's taxi fares, Roman will text Niko and say that the other drivers were getting jealous of Niko "taking all the fares" and that he should "use his fists" to gain money instead. After this, Niko can no longer collect fares.
After the mission Roman's Sorrow, even if the player has not completed all or any of the taxi missions, they will be permanently disabled as Roman's depot is burned down.
- Taxi missions are not required for 100% completion of the game, nor do they bring any achievement or bonus, apart from small monetary amounts of $20-$30 (considerably less if the player needs to use tollbooths). They were most likely included for the sake of the plot early on in the game, and to help the player familiarise themselves with the road layout while gaining some extra money.
- One of the fares that Niko picks up needs to go to Schottler Medical Center. Upon arrival, the fare will drop to the ground in a scripted animation. It is unknown what happens to the fare, though he may attempt to enter the hospital. Sometimes the fare will drop a small amount of cash after he collapses, which can be picked up by the player.