As they work, designers need constantly to keep in mind a large number of variables: Does this door permit enough side-impact protection?

All models met federal standards for 1997 side-impact protection, and offered anti-lock brakes.

The new frame not only provided greater side-impact protection than the "X" design but also improved interior roominess.

Safety was further improved on models from 1993 onward with the introduction of side-impact protection.

Dual air bags are standard, and both wagons meet the 1997 Federal standard for side-impact protection.

However, it also has two standout features one won't find on other infant car seats: an anti-rebound bar and customized side-impact protection.

Even the entry-level Explorer comes with all the crucial safety equipment, from air bags for side-impact protection to electronic stability control.

The stiffer panels work in concert with door beams to provide side-impact protection that meets the Federal edict for 1997.

While some research is being conducted, the agency has not taken any further steps on side-impact protection for infants and children.

Also high on the list were passenger air bags, seatbelts with height-adjustable anchor points, and advanced side-impact protection.