Zoox run their tests in San Francisco, a city known for chaotic traffic conditions. They do so rather successfully (see their YouTube videos). This accomplishment alone means they are not really "far behind".
Well I wouldn't expect them to post Car Crash Compilations of their own making.
San Francisco is one of the oldest cities in California, as such, the city layout is largely from the pre-automobile days.
A look at google maps shows the city is splits in large perfect squares of roads themselves split in smaller squares. It's typical US modern layout, the antithesis of European layout.
https://geoffboeing.com/2018/07/comparing-city-street-orient...