The problem is that people drive at the speed they feel comfortable at.
It doesn't make any sense to put a low speed limit if the road is wide and large. They should put a low limit and decrease the road width at the same time, to make it safer for bicycles and pedestrians (it's called "road diet", search for it!).
Also, search on YouTube has been utterly broken for years. You get at most 4 or 5 results and then a random series of videos that are completely unrelated to my search query.