Which also can and sometimes does lead to the motorist missing information that they should be reacting to. Like this morning in left turn lane. Lead driver was blasting stereo with windows up. Light turned green. Nothing. Driver behind me started to honk, and honk again. Nothing. They finally went just as the light turned red.

Of course it was not the isolation from the aural environment that lead to this. They were not paying attention at all, but if they had no blasting music they could have heard the secondary clue.

Of course a wise driver doesn't stop paying visual attention if they have headphones on.

I've seen similar non-reaction from drivers blasting music in response to emergency vehicles.

Al