I was driving my 2004 volvo c70 when i drifted off into a high curb. this caused my passenger airbag to deploy.the loud and disrupting noise then caused me to loose all control of the car. as i then ran through a fence and trees before i came to a stop. i was the only one in the car. so why did the empty passenger seat bag deploy. and why did the drivers airbag not deploy. *tr