Two back-to-back real-world demonstrations on June 21 made a strong case for where Tesla's Full Self-Driving system stands right now. One owner completed a 500-mile round trip between New Hampshire and New York City under FSD supervision alone. Hours later, FSD v14.3.4 was filmed navigating thick coastal fog on the way to Point Vicente Lighthouse in Palos Verdes — without hesitation.
Sawyer Merritt's Model Y handled the full New Hampshire-to-NYC-and-back journey with him in the driver's seat as a supervisor — nothing more. That's a continuous 500-mile FSD streak, the kind of distance that would have been unthinkable for consumer autonomy software just a couple of years ago. Merritt noted that Tesla's FSD is currently the only system capable of enabling this kind of hands-off highway travel at scale.
The fog footage from Whole Mars Catalog is arguably the more technically interesting clip. Adverse weather has historically been the sharpest edge of the wedge for camera-based autonomy systems — reduced visibility means reduced sensor confidence. FSD 14.3.4 appears to handle it without the hesitation or disengagement that plagued earlier versions. The system navigated the winding Palos Verdes roads to the lighthouse without incident.
These are user-reported demonstrations, not controlled Tesla tests — so individual results will vary based on route, traffic, and local conditions. But the pattern emerging from FSD 14.x builds is consistent: longer uninterrupted runs, more confident behavior in edge-case environments. If you're on v14.3.4 and haven't taken it on a longer highway stretch yet, today's reports suggest it's worth the experiment. For more on how FSD is evolving, see our FSD coverage.
Marcus covers Tesla's software releases, FSD rollouts, and OTA changes. Background in automotive engineering. Based in Austin.
Sources verified at publish time. Spotted an inaccuracy? Email editorial@basenor.com.
