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[@JimJimbrannan57](/creator/twitter/JimJimbrannan57)
"@elonmusk Caution to Everyone before you install FSD 14.x I recently completed a 3500-mile road trip in my 2026 Tesla Model Y Long-Range using FSD 13.2.9 covering round trips from Colorado Springs CO to Omaha NE and Las Vegas NV. While FSD performed reliably overall a significant issue arose that Tesla is worsening in FSD 14.x. On over XX highway instances FSD abruptly decelerated (e.g. from XX to XX mph or XX to XX mph) without any visible speed limit signs prompting the change. These areas had recent road construction and FSD relied on outdated map speed data instead of posted signs."  
[X Link](https://x.com/JimJimbrannan57/status/1979976656283681185) [@JimJimbrannan57](/creator/x/JimJimbrannan57) 2025-10-19T18:23Z XX followers, 2892 engagements