Tesla Model 3 Owners & Service Manuals

Tesla Model 3: Speed Assist

How Speed Assist Works

Model 3 displays a speed limit on the touchscreen and you can choose if and how you are warned when you exceed the speed limit. You can touch this speed limit sign to automatically change the set speed to the detected speed limit (including any offsets that you have set). Also, instead of using the detected speed limit, you can base warnings on an arbitrary speed limit that you enter manually.

How Speed Assist Works

In situations where Model 3 is unable to determine a speed limit, or if Speed Assist is uncertain that an acquired speed limit is accurate, the touchscreen may not display a speed limit sign and warnings do not take effect.

If you set the speed limit warning to Display and exceed the determined speed limit, the speed limit sign on the touchscreen increases in size.

If you set the speed limit warning to Chime and exceed the determined speed limit, the speed limit sign on the touchscreen increases in size and Model 3 also sounds a warning chime.

Note: Speed limit warnings go away after ten seconds, or when Model 3 slows down below the specified limit.

Warning: Do not rely on Speed Assist to determine the appropriate speed limit or driving speed. Always drive at a safe speed based on traffic and road conditions.

Controlling Speed Assist

To adjust the Speed Limit Warning setting, touch Controls > Autopilot > Speed Limit Warning, then choose one of these options:

  • Off - Speed limit warnings do not display and chimes are not sounded.
  • Display - Speed limit signs display on the touchscreen and the sign increases in size when you exceed the determined limit.
  • Chime - In addition to the visual display, a chime is sounded whenever you exceed the determined speed limit.

You can also specify how the speed limit is determined:

  • Relative - You can set a speed limit offset (+ or -) if you want to be alerted only when you exceed the offset speed limit by a specified amount. For example, you can increase the offset to +10 mph (10 km/h) if you only want to be warned when you exceed the speed limit by 10 mph (10 km/h).
  • Absolute - Manually specify any speed limit between 20 and 140 mph (30 and 240 km/h).

Note: Speed Assist is not always accurate. A road's location can be miscalculated and instead Speed Assist can display a speed for a directly adjacent road that may have a different speed limit. For example, Speed Assist can assume Model 3 is on a freeway or highway when it is actually on a nearby surface street, and vice versa.

Note: Your chosen setting is retained until you manually change it.

Limitations and Inaccuracies

Speed Assist may not be fully functional or may provide inaccurate information in these situations:

  • Visibility is poor and speed limit signs are not clearly visible (due to heavy rain, snow, fog, etc.).
  • Bright light (such as from oncoming headlights or direct sunlight) is interfering with the view of the camera(s).
  • Model 3 is being driven very close to a vehicle in front of it which is blocking the view of the camera(s).
  • The windshield is obstructing the view of the camera(s) (fogged over, dirty, covered by a sticker, etc.).
  • Speed limit signs are concealed by objects.
  • The speed limits stored in the map database are incorrect or outdated.
  • Model 3 is being driven in an area where GPS or map data is not available.
  • Traffic signs do not conform to standard recognizable formats.
  • A road or a speed limit has recently changed.

Warning: The list above does not represent an exhaustive list of situations that may interfere with proper operation of Speed Assist. Speed Assist may fail to provide warnings for many other reasons.


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