Final answer:
Vehicle crashes can be caused by factors like unsafe speed, improper turns, and violations of right-of-way rules.
Explanation:
All of the above are correct - Operating a vehicle at an unsafe speed, making an improper turn, and a violation of the right-of-way rules are common causes of vehicle crashes. For drivers over fifty-five years of age, failing eyesight, slower reflexes, and rapidly changing traffic conditions contribute to accidents.
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