prevent - ensure that it does not happen, collision - a violent impact of moving objects, manoeuvring area - part of an aerodrome to be used by aircraft for takeoff, landing, and taxiing, obstruction - something that blocks a path, expedite - speed up or make easy the action of something, provide - give something that is needed or wanted, advice -  recommendation as to appropriate choice, notify - inform someone, rescue - help which gets someone out of a dangerous situation, assist - give help or support to someone,

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