“Poor car-to-person fit is thought to be the leading cause of the increased risk of injury and fatality in [car accidents] for [people] who are obese or overweight versus [people] who are normal weight,” a portion of the study published by the Ottawa Citizen read.

The study continued, “For all those individuals that have a body structure different than [the standard used in designing cars], their interactions with the safety features, such as the seat belts and airbags, may not occur as intended.”

Many cars are reportedly designed with a 163-pound person in mind.