Why London buses are tilted nearly 30 degrees

London transport authorities actively demand an extreme level of acrobatic balance from a violently top-heavy, twelve-ton metal box. To pass strict safety certifications, every double-decker must undergo a terrifying "tilt test" where it is heavily loaded with sandbags on the top deck and tipped nearly 30 degrees to ensure it won't crush pedestrians during a sharp cornering maneuver.