make that car hum

kottke posted a great bit on japanese engineers making roads that play melodies as you drive over them, i love the idea of highway hackers :

Japanese researchers have developed “melody roads” that play tunes when you drive on them. You could use this technique for traffic calming…i.e. the road plays music only when you’re driving the speed limit and hope that there’s no second-order melody that plays at two times the speed limit to entice highway hackers to speed for forbidden tunes.