What is necessary for a vehicle to be considered roadworthy under legal requirements?

A vehicle is considered roadworthy under legal requirements primarily when it meets all road traffic law compliance. This encompasses a range of standards, including proper functioning of essential components like brakes, lights, tires, and steering. Ensuring compliance with road traffic laws guarantees that the vehicle is safe for operation on public roads, minimizing risks to the driver, passengers, and other road users.

The other options address characteristics that do not directly influence the legality or safety of a vehicle. Speed capability, being new, or having high-performance tires may enhance a vehicle's performance, but they are not fundamental requirements for a vehicle to be deemed roadworthy under the law. Roadworthiness focuses more on safety, maintenance, and adherence to regulatory standards than on performance metrics or the age of the vehicle.