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No they're not safe. Jet engines are very dangerous and extremely powerful. They can take your whole body if you get to close. Don't get so close if the aircraft engines are on.
25 ft in front, 200 ft behind
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If the volcano is erupting, ash can damage the aircraft and clog the engines, potentially causing a crash.
When driving in close proximity of an aircraft, you should never exceed a slow walking pace. 2 or 3 mph tops. If the aircraft is under power it has the right of way. You should not move your vehicle at all until making eye contact with the pilot.
Guns are good for close work, guided missiles are good for long range targets.