The average length of the reproductive cycle for females is 2â4 weeks. Females reach sexual maturity (puberty) between 8 and 18 months of age. There is a tremendous variability in the maturation age between breeds, and even within a breed of dog. The first stage of the reproductive cycle is proestrus, in which eggs in the ovaries begin to mature and estrogen levels begin to rise.
It usually takes a head-on impact into something fairly solid at 30mph or more to trigger a frontal airbag. A car could be involved in a roll-over crash at 100mph or more, where it could flip over several times, and if there was no significant single front impact detected, the airbags wouldn't trigger.
Serious or even fatal injuries can occur when someone is very close to, or in direct contact with an air bag module when the air bag deploys, NHTSA said. With recent emphasis on preventing potential airbag injuries, and with onboard computers deciding to deploy or not to deploy, its perhaps not surprising that airbags don't deploy in every collision, even in ones where occupants think they should have.