Assume that there is no way to prevent someone from using an interstate highway, regardless of whether or not he or she helps pay for it. This characteristic is associated with Public goods
Explanation:
Public goods are also known as non-exclusionary goods. This means that no one can be left out from the collective use of the goods for not paying to use it. These goods are meant for collective good. Some of the examples include roads, health, parks to name a few.
An Interstate highway maintained by a state authority is open for all its citizen. Since there is no way a state can prevent anyone from using it based on their payment it qualifies for the characteristic of being a public good.
