Tesla released its finest Full Self-Driving version yet on Tuesday (7th April), i.e., FSD v14.3. Tesla owners waited for months to get the FSD v14.3 update. Some YouTubers even stopped making videos of FSD v14.2 because of repetition and boredom.
The official release notes by the Tesla AI team outline the details of each area improved or totally revamped. Although it’s not explicitly mentioned, Tesla has tamed its most famous speed profile, ‘Mad Max’.
Mad Max mode is the most aggressive FSD speed profile. In previous versions of FSD v14, Mad Max mode was too fast for some users. In FSD v14.3, Tesla has made it more sane, as initial testing by beta testers suggests.
Mad Max Mode Highway Testing
Chuck Cook has been testing Tesla’s Full Self-Driving AI technology for the last few years in Jacksonville, Florida, and surrounding areas. He is one of the few early access members who have received the FSD v14.3 update.
During an FSD v14.3 test drive on a highway, Chuck turned on Mad Max mode. Chuck found out that the Mad Max speed profile was less aggressive compared to its previous behavior.
While driving in the right-most lane, FSD v14.3/Mad Max mode didn’t jump back to the center lane after crossing a truck. According to Chuck, it usually jumped back before the 14.3 update.
It still showed some aggressiveness when a vehicle tried to merge into the middle lane; FSD v14.3 didn’t give it way. However, as I observed, Tesla FSD was also monitoring the semi-truck ahead, which was also trying to merge into the middle from the left-most lane at the same time (watch below).
FSD v14.3 rushed to get ahead of the vehicle that was earlier trying to merge into the center. It’s an interesting scenario as Chuck’s Model Y Juniper was driving itself at speeds above 70 mph on Mad Max mode.
Here is highlight clip #4 from my FSD v14.3 First Impressions Drive.
— Chuck Cook (@ChuckCook) April 8, 2026
Earlier Decisions on Highway Navigation??? pic.twitter.com/XE7RaZv78r
Tunnel Challenge for FSD v14.3 in Mad Max Mode
Another Tesla owner who luckily received the FSD v14.3 AI software update tested it in an even more interesting scenario. Spencer took his FSD-driven Tesla car to a narrow tunnel.
The challenge was not just the narrow path. This tunnel is almost hidden on the right, and the entrance is on a four-way intersection. Both incoming and outgoing traffic pass through this tight tunnel.
FSD v14.3 using Mad Max speed profile slowed down as the tunnel approached. The vehicle crept slowly at first to judge the oncoming traffic. Finally, took it smoothly and confidently.
Tight tight tight tunnel on Mad Max with FSD 14.3 and the all-star supervisor @DavidMoss pic.twitter.com/qJtYohyiGw
— Spencer (@scotsrule08) April 9, 2026
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