Any product that requires refitting existing roads is pretty much dead in the water, there's a chicken and egg problem inherent in that solution because before

Any product that requires refitting existing roads is pretty much dead in the water, there's a chicken and egg problem inherent in that solution because before there's a push for billions of dollars and decades to be spent refitting the highway system there has to be a big demand for that project/product and that will only happen with a proven viable self driving car. And even once it starts the vehicle will only be useful once enough roads have be refitted. So a company has to 1) convince the US government to dedicate years and a few billion dollars to build them the infrastructure to run their product then 2) protect that funding across a couple decades (including multiple party switches) and 3) not go broke in the process waiting for the infra to be in place for people to actually buy their product.