Elon Musk just brought Tesla robotaxis to Dallas and Houston. The market he is targeting is worth $1 trillion

Elon Musk built Tesla into the world's most valuable car company. Now he is betting that its biggest returns will come from something else entirely.

Tesla launched its robotaxi service in Dallas and Houston on April 18, bringing the company's total US coverage to four cities. The official Tesla robotaxi account on X posted video of Model Y SUVs navigating both cities with no driver and no safety monitor in the front seat. Musk amplified the news with a simple post: "Try Tesla Robotaxi in Dallas and Houston!" Unlike the Austin rollout, which began with safety monitors before going fully driverless, Dallas and Houston launched unsupervised from day one.

Morgan Stanley analyst Andrew Percoco called the expansion "tangible progress at a time when the market was growing increasingly skeptical about Tesla's robotaxi expansion timeline." He described the move as a "material evolution" from Austin's cautious first steps and said a successful robotaxi rollout could create a powerful feedback loop across Tesla's entire ecosystem -- more rides, more real-world data, better AI, better Full Self-Driving software, and steadily lower costs per mile.

That cost advantage is central to the bull case. Morgan Stanley estimates Tesla's cost per mile at $0.81, compared to $1.43 for Alphabet's Waymo and $1.71 for traditional rideshare platforms. Tesla uses cameras only, no lidar, no radar arrays. That makes the vehicles cheaper to build and easier to scale, because the company does not need to pre-map a city before launching there. In principle, Tesla can move faster than any rival in the space.

How large is the prize? Morgan Stanley puts the US robotaxi addressable market at a minimum of $1 trillion, and potentially much larger. Light duty vehicles in the US traveled 3.4 trillion miles in 2024. Ridesharing services currently charge an average of $1.70 per mile. Even if robotaxis cut that price by two-thirds, the total addressable market would still approach $2 trillion. At 25% market penetration, annual robotaxi revenues in the US alone could reach between $250 billion and $500 billion. Wedbush analyst Dan Ives has set a path to a $3 trillion Tesla valuation if the robotaxi business scales as Musk intends.

The story is not without friction. Tesla has delivered nearly 700,000 paid robotaxi rides across Austin and the San Francisco Bay Area since launching those services, but Dallas and Houston geofences currently cover roughly 25 square miles each -- small zones that will need months of gradual expansion before they resemble Austin's current 245-square-mile footprint. Musk has also promised before. He predicted robotaxis would cover half the US population by the end of 2025. That did not happen.

The expansion is still accelerating. Tesla committed in its fourth-quarter 2025 shareholder update to launching in Las Vegas, Miami, Orlando, Phoenix and Tampa in the first half of 2026. By year-end, Musk is targeting a presence in a quarter to half of the United States, subject to regulatory approvals in each market.

Tesla stock closed at around $400 on April 17, up roughly 12% across the four sessions before the Dallas and Houston announcement. The gains come against a difficult backdrop: first-quarter deliveries of 358,023 vehicles missed Wall Street expectations, tariff headwinds on imported auto parts are squeezing margins, and political fallout from Musk's public activities has deterred some buyers. The core EV business is under pressure. The robotaxi business is the thesis that justifies the valuation.

Morgan Stanley frames it simply: the car is to Tesla what the book was to Amazon. What built the company was never meant to be the ceiling.