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That seems like it would be hard for horses? If it's a single horse pulling, then they constantly have to step over the middle stepping stone. And if it's a team, they're constantly having to avoid stepping into the wagon ruts.
Most roman carriages and wagons were carried by teams of two, which pretty much eliminates this problem.
It eliminates the issue of the center stone. But if it's a team, then each horse has a small gutter running right underfoot, with especially limited hoof-space next to the stepping stones. While trodding on stones that are under water/sewage, and slippery with all that. How do they avoid twisting their hock in the wheel ruts?
It's really not that narrow, horses have four legs, and they're designed for worse from nature's side. They didn't evolve for flat concrete roads.