Proving that London's double-decker buses were not a tipping hazard, 1933
Double-decker bus tilt testing. April, 1933. London.
For those who have visited London and wondered how they know their double-decker buses won’t fall over, this is apparently how they find out. Per police regulation, employees of the London General Omnibus Company put their 60-person bus to a “tilt test”. The test was considered passed if the double-decker buses would tilt 28 degrees without tipping. There are sandbags in the upper deck to simulate 60 passengers.