How do I detect a crash?

Question: I want to set up an alert to detect a possible crash indicated by a rapid deceleration event. What is a realistic g-force threshold for this event? G-force, jQuery(document).ready(function() { jQuery(".osc_tooltip").tooltip(); }); (as in gravitational) is not really a force; it is a felt weight based on acceleration or deceleration. Acceleration is the increase in rate of velocity/speed; deceleration is the decrease of rate of velocity/speed. The measurement involves location, speed, and time. Here are some real-world examples: Decent rollercoasters reach between 3-6g. Top fuel dragsters reach an average of 4g. Formula One cars during extreme braking maneuvers reach 5g. A high performance sports car jamming 0-60 in 2.5 seconds, only reaches 1.5g. DOT defines harsh (not dangerous) braking as .45g (Think of your average NYC cab driver). >25g means probable death or serious injury. In terms of crash detection, there are just too many variables to consider to…