In transportation, collision avoidance 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. Examples include:

• Airborne collision avoidance systems for aircraft
• Automatic Identification System for collision avoidance in water transport
• Collision avoidance (spacecraft)
• Collision avoidance system in automobiles^[1]
• Positive train control
• Tower Crane Anti-Collision Systems