Some cars are fast. Some cars are dangerous. And some cars are so extreme that they were never allowed on public roads. In this video, we’re looking at 5 powerful cars that were banned from roads or kept from being street legal because of safety rules, emissions standards, extreme modifications, or track-only engineering. From the legendary Nissan Skyline GT-R and its complicated U.S. import history, to the track-only LaFerrari FXX-K, the raw and safety-light TVR Tuscan, the ultra-rare Koenigsegg Agera R, and the modified Lamborghini Strosek Diablo, these cars prove that power, speed, and road legality do not always go together. Some were built for racing. Some failed to meet U.S. safety standards. Some were too modified for the street. But all of them became legends because they pushed performance beyond what regulators would allow.