stackyFACTSBecause civil engineers implicitly know that the average driver can barely steer a straight line without drifting.
Because civil engineers implicitly know that the average driver can barely steer a straight line without drifting. The standard US interstate lane is a generous 12 feet wide, whereas the average passenger car is only about 6 feet wide. This massive buffer zone is intentionally designed to accommodate oversized semi-trucks, but primarily, it exists to forgive the sheer, terrifying incompetence of motorists who decide to eat a hamburger and text their friends at 75 mph.
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