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How Speed Assist Works
If Model S is equipped with Autopilot
components (see About Driver Assistance on
page 65), the forward looking camera detects
speed limit signs. The signs are then analyzed
and compared against GPS data to determine
the speed limit at your current driving
location. For routes where no signs are
present, speed limits are determined using
GPS data (if available). Instead of determining
the speed limit based on signs and GPS data,
you can also manually enter an arbitrary speed
limit.
When Speed Assist is turned on (described
below), the instrument panel displays a speed
limit sign. Warnings (described below) take
eect when you exceed this limit.
In situations where Speed Assist is unable to
detect a speed (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
eect.
If you set the speed limit warning to Display
(see Controlling Speed Assist on page 88),
the speed limit sign on the instrumental panel
increases in size whenever you exceed the
speed limit.
If you set the speed limit warning to Chime
(see Controlling Speed Assist on page 88)
and exceed the speed limit, you also hear a
warning chime.
Note: Speed limit warnings go away after 10
seconds, or when Model S slows down below
the
specified limit.
Warning: Do not rely on Speed Assist to
determine the appropriate speed limit.
Always drive at a safe speed based on
trac and road conditions.
Controlling Speed Assist
To turn Speed Assist on or
o, and control
how it works, touch Controls > Settings >
Driver Assistance > Speed Limit Warning, then
choose one of these options:
•
O. Speed limit warnings do not display
on the instrument panel.
• Display. Speed limit signs display on the
instrument panel and when you exceed
the limit, the sign gets larger.
• Chime. In addition to the visual display,
you'll hear a chime whenever you exceed
the speed limit.
You can also specify how the speed limit is
determined:
• Relative. The speed limit is determined
automatically based on detected
trac
signs and GPS data. If desired, you can set
a speed limit oset (+ or -) if you want to
be alerted only when you exceed the
speed limit by a
specified amount. For
example, you would increase the oset to
+10 mph (10 km/h) if you only want to be
alerted 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: GPS data is not always accurate. The
GPS can misjudge the road's location and
provide the speed limit for a directly adjacent
road that may have a
dierent speed limit. For
example, the GPS can assume Model S is on a
freeway when it’s actually on a nearby surface
street, and vice versa.
Note: Your chosen setting is retained until you
manually change it. It is also saved in your
driver
profile.
Speed Assist
88 Model S Owner's Manual
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