Any road without a toll can be thought of as a common resource since it is nonexcludable and rival in consumption.

Common Resource

A resource like air or water that is non-excludable and rivalrous, meaning it's impossible to prevent anyone from using it, but one person's use diminishes another person's ability to use it.

Nonexcludable

A nonexcludable good is one where it is not possible to prevent people who have not paid for it from having access to it, typical in public goods.