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<p>In transportation, <b>collision avoidance</b> is the maintenance of systems and practices designed to prevent vehicles (such as aircraft, motor vehicles, ships, cranes and trains) from colliding with each other. They perceive the environment with sensors and prevent collisions using the data collected from the sensors. Collision avoidance is used in autonomous vehicles, aviation, trains and water transport. Examples of collision avoidance include:<br/>
* <a href="page.php?w=Airborne_collision_avoidance_systems">Airborne collision avoidance systems</a></p><p>
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