Honda Civic 2017 Owner's Manual page 472

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With Little Chance of a Collision
The CMBS may activate even when you are aware of a vehicle ahead of you, or
when there is no vehicle ahead. Some examples of this are:
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When Passing
Your vehicle approaches another vehicle ahead of you and you change lanes to pass.
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At an intersection
Your vehicle approaches or passes another vehicle that is making a left or right turn.
uuHonda Sensing * uCollision Mitigation Braking System (CMBS)
1With Little Chance of a Collision
Do not paint, or apply any coverings or paint to the
radar sensor area. This can impact CMBS operation.
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