There are a few other similar trolley rides in different cities of that era but this is the most compelling one for some reason. It really seems to capture the moment. Considering cars were pretty recent and not yet mass produced (except the curved dash Olds) there sure seems to be a lot of them. And direction of travel appears to be more of a suggestion although there is a general flow. The cops aren't fazed by any of the chaos.
For anyone interested there is a wealth of these vintage films some more interesting than others and moving pictures themselves were a pretty new technology. Many of these films were shown to the public and advertised as a way for people to see themselves although I am not sure the one linked in the OP was one of them.