Tesla Model S: Limitations and Inaccuracies

Lane Assist features cannot always 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 S 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 or cameras is damaged, dirty, or obstructed (by mud, ice, or snow, or by a vehicle bra, excessive paint, or adhesive products such as wraps, stickers, rubber coatings, etc.).
• 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 S 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 S away from an adjacent vehicle, or may apply unnecessary or inappropriate steering, in these situations:

• You are driving Model S 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 S is not traveling within the speeds at which the Lane Assist feature is designed to operate.
• One or more of the ultrasonic sensors is damaged, dirty, or obstructed (such as by mud, ice, or snow, or by a vehicle bra, excessive paint, or adhesive products such as wraps, stickers, rubber coating, etc.).
• 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 S (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 features. There are many reasons why Lane Assist may not operate as intended. To avoid a collision, stay alert and always pay attention to the road so you can anticipate the need to take corrective action as early as possible.

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