Roads are a good example of a quasi-public good. This is because once a road is provided, most people, whether or not they have a driver's license, can use them.
Public goods have two elements to them. Nonrivalry means that when a good is used it does not reduce what is available for others to use. Non-excludable means the good can't be provided without preventing others from enjoying the good. A quasi-public good is a mixture of both a nonrivalry and non-excludable goods. A road is a good example because once provided, the amount someone benefits from using the road is reduced because increased use causes increased congestion on the roadway.