Annoying sounds from cars at stop light

I don't think they hear it. They are listening to the speakers facing them, you are listening to the whole car resonating and turning into a huge speaker. Maybe we should have posit notes preprinted that say " Please turn that music down, I have a baby sleeping on the floor." 

Wonder if that would work. Probably not...

soundsrealaudio said:
" I was trying to discover the speed with which air travels through sheet rock but couldn't locate that info."

So, air travels through sheet rock at speed?

If this helps, the speed of sound in concrete is about 10 times the speed of sound in air. 

http://en.wikipedia.org/wiki/DB_drag_racing

They don't let people in the car during these "competitions", but if it is loud to you at the stop light in the next car over, it is incredibly intense inside the car with the loud stereo.

I am going to do an experiment. My son has a sub woofer in his trunk. I am going to take it out and put it on the grass, turn it up and see what happens. 

Any guesses???????