California will require kids 8 to 16 to pass a seat belt fit test starting in 2027 to ensure proper safety.

California will require children aged 8 to 16 to pass a five-step seat belt fit test starting in 2027 to determine if they can safely use a seat belt without a booster. The test checks proper seating position, knee bend, and belt placement across the shoulder and lap. If a child fails, drivers may face a $490 fine. The law maintains the existing booster seat requirement until age 8 or 4 feet 9 inches tall, focusing on height and posture over age. It reflects a compromise after a broader bill failed due to opposition. Advocates say it improves safety by ensuring proper seat belt fit, aligning with recommendations from public health experts and the California Highway Patrol.