We can complete the sentence with "single-vehicle crashes," since this type of collision involves only one vehicle and a fixed object, or rolling over.
What is a single-vehicle crash?
As its name suggests, the single-vehicle crash is a type of traffic accident or collision that only involves one vehicle. Examples of single-vehicle crashes would be:
Studies have found that single-vehicle crashes are a common occurrence among inexperienced young drivers. Therefore, we can conclude the answer provided above is correct.
Learn more about types of collisions here:
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