If, in this case, our liberty endangered the lives of others, it is better to have safety.
For instance, say someone had the freedom to choose whether or not to have seat-belts, and chose against them. Seat belts are useful for keeping the driver in his seat. If the driver begins to slide off of his seat as he is turning a corner, his foot could come off of the pedal, and he could loose control and cause a collision. Same could be said of turn signals. If there were no turn signals, it would be very difficult to interpret the intentions of the driver, and the possibility of a collision is likely.
If these decisions only affected the person making them, that would be fine; I would choose liberty. But when it affects those around them, certain saftey measures are mandatory to prevent someone's bad decision from causing the harm of another person.