What's this all about?

But the inability of drivers to stop cars in emergencies shows the importance of simple, familiar controls such as [...] radio knobs that adhere to the age-old convention of having a large volume and power knob on the left side of the radio face and a large tuning knob on the right side.
What's the radio got to do with emergency stopping? Isn't it possible to avoid an accident without having your favourite Tupac song playing?