Tesla S 2017 - Speed Assist; How Speed Assist Works; Controlling Speed Assist

How Speed Assist Works
If your Model S is equipped with Driver
Assistance components (see About Driver
Assistance on page 73), the forward looking
camera(s) detect speed limit signs. The speed
limit signs are then analyzed and compared
against GPS data to determine the speed limit
at your current driving location. For routes
where no speed limit signs are present or
cannot be detected, speed limits are
determined using GPS data (if available).
Instead of determining the speed limit based
on speed limit signs and GPS data, you can
also manually enter an arbitrary speed limit.
Note: The cameras cannot detect speed limit
signs at this time. This functionality is
expected to be implemented in a future
software update.
When the Speed Limit Warning is turned on
(described below), the instrument panel
displays a speed limit sign. Warnings
(described later) take
eect when you exceed
this limit.
In situations where Speed Assist is unable to
determine a speed limit (for example, speed
limit signs and GPS data are not available at
the current location), or if Speed Assist is
uncertain that an acquired speed limit is
accurate (for example, although a speed limit
sign was initially detected, some time has
passed before a subsequent sign has been
detected), the instrument panel may not
display a speed limit sign and warnings do not
take
eect.
If you set the speed limit warning to
Display
(see Controlling Speed Assist on page 97)
and exceed the determined speed limit, the
speed limit sign on the instrument panel
increases in size.
If you set the speed limit warning to Chime
(see Controlling Speed Assist on page 97)
and exceed the determined speed limit, the
speed limit sign on the instrument panel
increases in size and Model S also sounds a
warning chime.
Note: Speed limit warnings go away after ten
seconds, or when Model S 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 trac and road
conditions.
Controlling Speed Assist
To adjust the Speed Limit Warning setting,
touch Controls > Settings > Driver
Assistance > Speed Limit Warning, then
choose one of these options:
•
O - Speed limit warnings do not display
and chimes are not sounded.
• Display - Speed limit signs display on the
instrument panel 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 - The speed limit is determined
automatically based on detected
trac
signs and GPS data. If desired, you can set
a speed limit oset (+ or -) if you want to
be alerted only when you exceed the
oset speed limit by a specified amount.
For example, you can increase the
oset
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).
Note: The
oset from speed limit also
aects the number shown in the gray
speedometer icon on the left side of the
driving speed on the instrument panel.
• Absolute - Manually specify any speed
limit between 20 and 140 mph (30 and
240 km/h).
Speed Assist
Driver Assistance 97