2012 Lexus HS 250h Owners Manual - Page 251

251

2-4. Using other driving systems

2

CAUTION

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Limitations of the pre-collision system

Do not overly rely on the pre-collision system. Always drive safely, taking care to

observe your surroundings and checking for any obstacles or other road hazards.

Failure to do so may cause an accident resulting in death or serious injury.

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Cautions regarding the assist contents of the system

By means of alarms and brake control, the pre-collision system is intended to assist

the driver in avoiding collisions through the process of LOOK-JUDGE-ACT. There

are limits to the degree of assistance the system can provide, so please keep in mind

the following important points.

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Assisting the driver in watching the road

The pre-collision system is only able to detect obstacles directly in front of the

vehicle, and only within a limited range. It is not a mechanism that allows careless

or inattentive driving, and it is not a system that can assist the driver in low-visibil-

ity conditions. It is still necessary for the driver to pay close attention to the vehi-

cle’s surroundings.

●

Assisting the driver in making correct judgment

When attempting to estimate the possibility of a frontal collision, the only data

available to the pre-collision system is that from obstacles it has detected directly

in front of the vehicle. Therefore, it is absolutely necessary for the driver to remain

vigilant and to determine whether or not there is a possibility of collision in any

given situation.

●

Assisting the driver in taking action

The pre-collision system’s braking assist feature is designed to help reduce the

severity of a collision, and so only acts when the system has judged that a collision

is unavoidable. This system by itself is not capable of automatically avoiding a col-

lision or bringing the vehicle to a stop safely. For this reason, when encountering a

dangerous situation the driver must take direct and immediate action in order to

ensure the safety of all involved.