The air bags should definetely have deployed at that speed. You should contact the car manufacutrer right away so they can look at it. It is possible however, to miss the sensors that tell the air bags to deploy. They are set back from the bumper and grill enough to avoid going off in a low speed colision but if you hit the ditch in just a certain way that it didn't push the bumper back enough to contact the sensors, they wouldn't go off. Still, I would say the fuse was blown on the airbag circuit or the air chamber was empty already or some other malfunction but still, contact the manufacturer. I'd call them instead of the garage that sold you the car in the first place so you get a second opinion.
Airbags deploy at up to 300 km/hr.
The minimum speed set by the government for airbags to deploy is 25 mph. The 2007 PT Cruiser should have the airbags deploy at this rate of speed or less. It also depends on the type of collision, when the airbags will deploy.
Yes if the car is hit hard enough the sensors will deploy the airbags
Air bags deploy when someone gets into an accident.
crashing
there is no minimum speed the car can be parked and someone run into it and the airbags can deploy
they can deploy 1min to thirty seconds
no
The force of the collision , with the front of your vehicle , has to be great enough for the airbags to deploy
http://www.nhtsa.dot.gov/people/injury/airbags/airbags03/page3.html
200 mph
true