When Roland Ratzenberger and Ayrton Senna were killed at Imola in 1994, Formula 1 officials and race fans alike began asking if it was right to expect a driver to risk his life. A flurry of rule changes followed. David Tremayne, author of The Science of Speed, examines the history, philosophy and technology behind F1’s ever-evolving safety regulations, and talks to the men who have campaigned to raise standards. They met deep resistance in sport that still romanticises the pioneering days when it was not unusual for several drivers to be killed in a single season.