Lexus CT200h Owner's Manual page 262

2-4. Using other driving systems
Approach warning
When your vehicle is too close to a vehicle ahead, and sufficient
automatic deceleration via the cruise control is not possible, the
display will flash and the buzzer will sound to alert the driver. An
example of this would be if another driver cuts in front of you
while you are following a vehicle. Apply the brakes to ensure an
appropriate vehicle-to-vehicle distance.

Warnings may not occur when
In the following instances, there is a possibility that the warn-
ings will not occur:
 When the speed of the vehicle ahead matches or exceeds your
vehicle speed
 When the vehicle ahead is traveling at an extremely slow
speed
 Immediately after the cruise control speed was set
 At the instant the accelerator is applied
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