No person shall drive a vehicle upon a highway at a speed greater than is reasonable or prudent having due regard for weather, visibility, the traffic on, and the surface and width of, the highway, and in no event at a speed which endangers the safety of persons or property

What you are talking about, I think is called the general speed law. Basically as fast as road conditions allow. Above is from California https://california.public.law/codes/vehicle_code_section_22350