The article you are pointing to does not currently cite roads as an example of a public good, but it does give the definition I used above: non-excludable and non-rival. I didn't edit it. Tollbooths, roadblocks, and gated communities are a manifestation of the excludability of roads; traffic, traffic accidents involving more than one vehicle, and potholes are manifestations of their rivalrousness, to which we have responses such as traffic laws, road maintenance, gasoline taxes, rearview mirrors, and seatbelts.

In short, every aspect of how we interact with roads and cars is pervasively shaped by the rivalrous nature of roads, and their excludability profoundly affects many social institutions. Only in the most rural areas are roads even approximately non-excludable or non-rival.