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.
Airbags prevent occupants from hitting parts inside the car and also help cushion the violent movement of the body during an impact. Here's how they work: Sensors in the car detect when an impact has happened. The sensors send a signal indicating sudden deceleration to a computer inside the car. Airbags won't deploy in low-speed crashes in which seatbelts alone should provide enough protection. The computer determines, based on the signal it's getting from the sensor, whether the airbag needs to deploy.