Remember kids... always wear a helmet. (The almighty bikeradar helmet thread)

...and riding with an ipod is not as dangerous as listening to music in a car perhaps
http://rideons.wordpress.com/2012/07/09/an-ear-on-the-traffic/
But there's nothing in that article that mentions danger at all (other than a link to a website discussing safe decibel levels for your hearing itself).

Where do you get this conclusion about riding with an ipod being less dangerous than listening to music in a car?