How can I make the car safe for my 15-month-old?

Rear facing car seat. Any kid facing forward is at risk of spinal cord damage when the unrestrained head snaps forward in a crash.See www.Joelsjourney for the effect on a 33lb 15mo. The aap & nhtsb recs to rear face untill at least 2. As neck strength improves risk declines.I have cared for a quadraplegic infant from this injury.Parents or drs who ff @ 1yr are uninformed or negligent.
Car seat. Never leave your child alone in the car. Use an approved toddler car seat correctly and wear your seat belt.