Tesla Model 3 Owners & Service Manuals

Tesla Model 3: Adjacent Lane Speed

Due to market region and vehicle configuration, this feature may not be available on your vehicle.

When your vehicle is moving at a significantly faster speed than neighboring lanes, Model 3 automatically reduces your driving speed. This is especially helpful in heavy traffic situations or when vehicles are constantly merging into different lanes. When Model 3 detects that neighboring driving speeds are significantly slower, the neighboring lane is highlighted with arrows and detected vehicles are highlighted gray on the touchscreen, and your vehicle slows down as appropriate. This functionality can be temporarily overridden by pressing the accelerator pedal. Never rely on Autopilot to determine a safe driving speed; you are responsible for the vehicle and obeying traffic laws.

Limitations and Inaccuracies

Lane Assist cannot always clearly detect lane markings and you may experience unnecessary or invalid warnings in these situations:

  • Visibility is poor and lane markings are not clearly visible (due to heavy rain, snow, fog, etc.). The exact detection zone of the ultrasonic sensors varies depending on environmental conditions.
  • Bright light (such as from oncoming headlights or direct sunlight) is interfering with the view of the camera(s).
  • A vehicle in front of Model 3 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.).
  • Lane markings are excessively worn, have visible previous markings, have been adjusted due to road construction, or are changing quickly (for example, lanes branching off, crossing over, or merging).
  • The road is narrow or winding.
  • Objects or landscape features are casting strong shadows on lane markers.

Lane Assist may not provide warnings, or may apply inappropriate warnings, in these situations:

  • One or more of the ultrasonic sensors is damaged, dirty, or obstructed (such as by mud, ice, or snow).
  • Weather conditions (heavy rain, snow, fog, or extremely hot or cold temperatures) are interfering with sensor operation.
  • The sensors are affected by other electrical equipment or devices that generate ultrasonic waves.
  • An object that is mounted to Model 3 is interfering with and/or obstructing a sensor (such as a bike rack or a bumper sticker).

In addition, Lane Assist may not steer Model 3 away from an adjacent vehicle, or may apply unnecessary or inappropriate steering, in these situations:

  • You are driving Model 3 on sharp corners or on a curve at a relatively high speed.
  • Bright light (such as from oncoming headlights or direct sunlight) is interfering with the view of the camera(s).
  • You are drifting into another lane but an object (such as a vehicle) is not present.
  • A vehicle in another lane cuts in front of you or drifts into your driving lane.
  • Model 3 is traveling slower than 30 mph (48 km/h) or faster than 90 mph (145 km/h).
  • One or more of the ultrasonic sensors is damaged, dirty, or obstructed (such as by mud, ice, or snow).
  • Weather conditions (heavy rain, snow, fog, or extremely hot or cold temperatures) are interfering with sensor operation.
  • The sensors are affected by other electrical equipment or devices that generate ultrasonic waves.
  • An object mounted to Model 3 (such as a bike rack or a bumper sticker) is interfering with or obstructing a sensor.
  • Visibility is poor and lane markings are not clearly visible (due to heavy rain, snow, fog, etc.).
  • Lane markings are excessively worn, have visible previous markings, have been adjusted due to road construction or are changing quickly (for example, lanes branching off, crossing over, or merging).

Warning: The lists above do not represent every possible situation that may interfere with Lane Assist warnings. Lane Assist may not operate as intended for many other reasons. To avoid a collision, stay alert and always pay attention to the roadway when driving so you can anticipate the need to take corrective action as early as possible.

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