War chariots?! War fucking chariots? And enough if them to leave marks in streets? That guy is off by a few centuries and a few kilometers there. War chariots were a thing in ancient Egypt, long before Rome even thought of existing. Rome didn't use those, at least not in any meaningful numbers
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.
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?