How fast did the cars go in 1930?
just 11 km / h ( 7mph )
Why do most cars have speedometers that go up to at least 130 when you legally can't go that fast on any road?
Not only is it illegal to go that fast on most roads, but it also impossible to go that fast in most cars due to fuel cut off, otherwise known as a speed governor or limiter. However, many cars capable of doing that kind of speed or sometimes much higher are performance based cars which are more likely to end up on drag strips.