Why is the New Jersey Turnpike called a turnpike?

Answer 1

Access to toll roads was originally controlled through the use of a pike, a weapon similar to a spear or halbard with a sharp metal point at the end. You paid the toll and the toll taker would turn the pike to allow you on to the road. Since those days toll roads often are called turnpikes to identify the fact that you must pay to use it. It is nicer than saying toll road, which is another term you will find in use.