The most complete description of Gatsby's car is in chapter four. Gatsby drives to Nick's house to pick him up for lunch in Manhattan. The car has a "three-noted horn" that Gatsby sounds as he arrives. Gatsby's car is a creamy yellow standard-shift Rolls Royce convertible with a green leather interior, and Nick describes it as extraordinarily long, with all sorts of compartments for "hat-boxes and supper-boxes and tool-boxes" and nickel trim. On weekends, Gatsby uses the car to bring people to and from the city for his house parties.
Gatsby's Rolls Royce is very showy in contrast to Tom Buchanan's conservative blue coupe. Tom disdains Gatsby's car by calling it a "circus wagon" in chapter eight, though he does insist on driving it to Manhattan despite Gatsby's protest.