When Safety Makes Us Dangerous
In 1975, economist Sam Peltzman published a bombshell finding: mandatory seatbelts and other car safety regulations had not reduced total highway deaths. Why? Because drivers, feeling safer, drove more recklessly.
This is risk compensation: when we feel protected, we take greater risks—often canceling out the safety benefit entirely. The safeguard becomes a license to be careless.
Studies show most people increase speed by 10-20% when wearing safety gear.
The offsets due to risk compensation are virtually complete, so that regulation has not decreased highway deaths.
Note: Later research found the effect exists but typically offsets less than half of safety benefits, not "virtually all" as Peltzman initially claimed.
1994 Study: Belted drivers drove faster and less carefully
ABS 2004: 18% fewer multi-vehicle crashes, but 35% MORE run-off-road crashes
Motorcycle ABS: 37% fewer fatal crashes (effect sometimes wins)
Typical offset: 25-50% of safety benefit lost to compensation
The Peltzman Effect doesn't mean safety measures are useless—just that their benefits are often partially offset by behavioral changes. The effect is typically 25-50%, not 100%.
But it's a crucial reminder: you are the variable. A helmet protects you—unless you use it as permission to take crazy risks. Technology can't save us from ourselves.
Peltzman, S. (1975). "The Effects of Automobile Safety Regulation." Journal of Political Economy, 83(4), 677-726.