InvinciCar Online is a browser-based car racing MMO game.
InvinciCar is not the most realistic game from the standpoint of physics of the car (the car does not have collision damage), but from the graphics and gameplay perspective is most shiny and hi-tech 3D browser game out there, you not gonna believe how good it looks and play.
You can compete online with other players in 2 tipe of races and a variant race, ofline against time. Controls of the car is satisfactorily, reacts well to commands from the directional arrows keys. At garage it's possible to customize your car's appearance and performance, you can also buy new cars.
Overall the game is a very pleasant surprise from a browser game and definitely worth playing even if still have several small isues and not fully simulate a realistic race, but it's more a matter of taste in terms of realistic simulators.