Tesla MODEL S 2012 Owner's Manual page 109

• 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.
Active Safety Features
Lane Assist
107