The center of the back seat is generally considered the safest spot for a car seat, primarily because it puts the most distance between your child and any side impact. That said, the real-world injury data is more nuanced than the common advice suggests, and the “safest” position often depends on your specific vehicle and how securely you can install the seat.
Why the Center Seat Gets Recommended
The logic behind the center position is straightforward: side-impact crashes are the second most common crash type, and the center seat is the farthest point from either door. Research on pediatric injuries in side collisions consistently shows that children seated on the struck side of the vehicle sustain the most serious injuries. One study found that all serious injuries in side impacts occurred in children seated on the side of impact. Among children ages 5 to 9, four out of six who were seriously hurt were on the near side. Older children (10 to 15) who suffered pelvic or femur fractures were all sitting next to the intruding door.
Placing the car seat in the center eliminates the possibility of your child being on the “near side” of a side-impact crash, no matter which direction the other vehicle comes from.
The Numbers Are Closer Than You’d Think
A widely cited study looked at injury rates for children ages 2 to 14 in frontal and side-impact crashes. The combined injury rate was 1.8% for children buckled in outboard (left or right) rear seats and 0.5% for those in the center. That looks like a big difference at first glance, but the researchers found it was not statistically significant, meaning the gap could be due to chance rather than a true safety advantage.
Breaking the data down further makes the picture even clearer. In frontal crashes alone, injury rates were essentially identical: 1.0% outboard versus 1.1% center. In side impacts, the rates were also nearly the same: 1.5% outboard versus 1.4% center. The center position doesn’t appear to offer a dramatic, measurable advantage in real-world crash data, even though the physics make intuitive sense.
A Secure Installation Matters More Than Position
A car seat that’s loosely installed in the center is less safe than one that’s rock-solid on either side. This is where practical constraints come in. Many vehicles don’t have dedicated LATCH anchors in the center rear position. The AAA Foundation for Traffic Safety has specifically flagged this as a widespread problem, recommending that manufacturers provide center LATCH in all vehicles where space allows. Without those dedicated anchors, some parents try to use the inner anchors from the two outboard positions, which vehicle manufacturers may not approve. Using anchors in a way that isn’t specified in your vehicle’s manual can result in an unstable installation.
If your vehicle does have center LATCH anchors (check the owner’s manual), the center is a good default. If it doesn’t, you can install with the seat belt instead, but you need to confirm the center seat belt locks properly to hold a car seat tight. Some vehicles have only a lap belt in the center, with no shoulder belt, which limits your options depending on the type of car seat you’re using.
The bottom line: if you can get a tight, stable installation in the center, use the center. If you can’t, pick whichever outboard position gives you the most secure fit.
Left Side vs. Right Side
If the center isn’t an option, you’re choosing between the driver’s side (left in the U.S.) and the passenger side (right). Neither side has a clear, research-backed safety advantage over the other. Side impacts can come from either direction, and frontal crashes affect both outboard positions equally.
Some parents prefer the passenger side because it places the car seat curbside when parked on a street, making it easier and safer to load and unload the child away from traffic. Others prefer the driver’s side because the driver can more easily glance back at the child. These are convenience considerations, not safety ones. Pick whichever side works best for your routine.
Side Impacts and Restraint Type
In side crashes, being restrained helps, but the benefit varies by the child’s size and position. For adults and older children sitting on the far side (away from impact), seat belts cut the rate of serious injury roughly in half. For younger children in car seats, the picture is more complicated. Small children can slip out of a shoulder belt designed for adults, and researchers have documented cases where properly restrained toddlers on the far side still struck their heads on the vehicle interior during a side impact.
This reinforces why a properly installed, age-appropriate car seat matters more than obsessing over left versus right. A rear-facing seat for infants and toddlers provides critical protection for the head, neck, and spine regardless of which rear position it occupies. Keeping children rear-facing as long as the seat’s height and weight limits allow is one of the most effective things you can do.
Quick Guide to Choosing a Position
- Center rear seat: Best option if your vehicle supports a secure installation there, either with center LATCH anchors or a locking seat belt.
- Either outboard seat: Equally safe if the center isn’t practical. Choose based on convenience, like curbside access or visibility from the driver’s seat.
- Installation quality: A tight fit with less than one inch of movement at the belt path beats a theoretically better position with a loose install every time.
If you’re unsure whether your installation is secure, certified car seat technicians offer free inspections at fire stations, hospitals, and community events across the country. The NHTSA maintains a searchable directory of inspection stations by zip code.