is made to deploy the air bag blocks 44 and 46 issue a deployment command otherwise reset block 48 examines the available data to determine whether the crash event is continuing and thus whether the deployment calculation should continue in the preferred embodiment there are three ways to reset two of them are based on a measure called 34 predicted velocity at 100 ms 34 that is using the current acceleration the current accumulated velocity and the time from enable an estimate of velocity at 100 ms from enablement is made the first reset test is that if after a minimum of 10 ms from enablement the predicted velocity at 100 ms is below a preset threshold such as 3 mph reset is commanded the second test requires that peaks of the predicted velocity be detected if the current predicted velocity at 100 ms is a preset percentage below its last peak reset is commanded for example if the percentage is set at 50 and the predicted velocity rises to 10 mph and then drops to 5 mph the test is satisfied the third reset test is via a heavily filtered value of acceleration if that value reaches a first threshold say 3 g and subsequently falls below a second lower threshold such as 2 g reset is commanded the first two tests which are based on predicted velocity are effective in resetting during rough road events shortly after enablement and the third test is designed to reset the algorithm after the event has ended and no deployment was determined when a reset is commanded by block 48.