The goal for alternative transit is not to remove traffic jam, it's to transport people.
9mph is slower than a bike, it fits with my experience. When living in a city (in Europe, it might be different in the US) my feeling was always that bike was the fastest, public transport a bit slower but more comfortable (mainly protected from the elements and car drivers) and lastly car was the slowest and more stressful.
Hands up for 80s and 90s nostalgia ( i.imgur.com )
Here's Proof that Earth is flat ( lemm.ee )
Just one more lane ( sh.itjust.works )
Down under ( sh.itjust.works )