Mazda MX-5 Miata 2004 Owner's Manual page 36

M Air Bag Activation/Deactivation
Air bag activation
A greater than moderate impact will cause the air bags to inflate in the following cases:
Hitting a solid wall straight on at greater
than about 22 km/h (14 mph).
Hitting a curb, pavement edge or hard
object.
Landing hard or the vehicle falling.
Frontal impact within about a 30 degree
range from head-on to the vehicle.
Driving into a big hole or hitting the far
side of a hole.
Essential Safety Equipment
SRS Air Bags
2-27