Multiplayer is a feature that was added in Update 1.18.1.
It has three options: Quick Race, Quick Drift and Custom Lobbies.
Quick Race is a Head-To-Head style race, selects a random track and sets 2 laps. For a fair race, only cars in the same class (regardless of tuning) can race each other.
Quick Drift is 4 player drift race, selects a random track and a set time to gain points by drifting. FF cars are banned from entering drift races.
Custom Lobbies allow players to create and join custom made lobbies. Currently it only has a free roam mode available. Up to 8 players can be in the same session.