I completed a clinical rotation at a suburban hospital emergency department built in the boom of the 1950s. There was an apocryphal story circulating at the time about how things used to be, given the department was undergoing planning for replacement in the next half-decade.
In earlier years, there used to be 3 neurosurgeons kept on staff. Once seatbelt laws came into effect in the 1970s, that number went down to 1.