1993 marked the height of the use of electronics technology in Formula One, with perhaps the most advanced and sophisticated F1 cars ever built. The championship-winning Williams car, the FW15C, featured hydraulically and electronically-controlled active suspension, power steering, anti-lock brakes, fly-by-wire controls, traction control, a semi-automatic gearbox that could be switched over to fully-automatic, highly sophisticated onboard telemetry, pneumatic valve springs in the engine, and even a "push-to-pass" system that, at least in theory, made overtaking easier. Williams also tested a continuously variable transmission, while Benetton-Ford tested a four-wheel steering system late in the season. Nearly all cars in 1993 had an active suspension system, which kept the car's ride height consistent throughout a lap, making the aerodynamics of the car more efficient and effective. All these systems would be banned for , except for the on-board telemetry, pneumatic valve springs, and power steering.