Lexus 2008 IS250 Owner's Manual page 160

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2-4. Using other driving systems
Automatically cancelling constant speed control
n
The set speed is automatically canceled in the following situations.
Actual vehicle speed is more than 10 mph (16 km/h) below the preset vehicle
l
speed
At this time, the memorized set speed is not retained.
Vehicle speed falls below 25 mph (40 km/h)
l
VSC is activated
l
Vehicle-to-vehicle distance settings
n
Select a distance from the table below. Note that the distances shown correspond
to a vehicle speed of 50 mph (80 km/h). Vehicle-to-vehicle distance increases/
decreases in accordance with vehicle speed.
Distance options
Medium
Radar sensor and grille cover
n
Always keep the sensor and grille cover clean to ensure that the vehicle-to-vehicle
distance control operates properly. (Some obstructions, such as snow, ice or plastic
objects, cannot be detected by the obstruction sensor.)
Dynamic radar cruise control is canceled if an obstruction is detected.
160
Long
Short
Vehicle-to-vehicle distance
Approximately 164 ft. (50 m)
Approximately 132 ft. (40 m)
Approximately 100 ft. (30 m)
Grille cover
Radar sensor

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