"In every study that considered the question"

Many drivers fail to turn on their headlights during heavy rain due to confusing iconography on car light controls, where the symbols for different light settings appear arbitrary and poorly differentiated. The interface is optimized for muscle memory rather than intuitive understanding, and drivers receive minimal feedback from inside the vehicle about whether their tail lights are actually activated. In every study that considered the question, unclear UI design contributed significantly to safety issues on the road during low-visibility conditions.