What is the fastest street legal car, actually demonstrated, in the world?

On Dec. 9, 2022, the Gas Monkey Garage-sponsored 2006 Ford GT known as the “BADD GT,” achieved a top speed of 310.8 mph (500.1 km/h) at Space Florida’s Launch and Landing Facility, located in Kennedy Space Center, Florida, making this car the fastest street legal car in the world.