All parents want to keep their kids safe whether it's taking a trip down the street or across the country. 

But the seat your child is strapped in could be less effective in a crash if it's not installed properly. AAA reports three out of four car seats are installed incorrectly; a dangerous statistic for our most precious cargo. 

That's why a group of certified child safety technicians with Hamilton County Sheriff's Office Safe Journey hold checks like this one. 

Becky Campbell says the most common mistake parents make is positioning the harness clip too low. It should be at armpit height. 

"The harness clip plays a huge roll in keeping the straps over the shoulder and the child in the car seat," she said. 

Deputies saw last week the role car seats play in a crash that killed a 2-year-old on Boy Scout Road. Even though the cause is still under investigation, deputies say the car seat wasn't properly installed and the boy wasn't properly restrained. 

David Combs stopped by with 3-year-old, Eli. They're gearing up for a family trip to the Smokey Mountains but before hitting the road, Combs wanted to make sure Eli's car seat was good to go. 

"We didn't have to have some anchors that we had on there just for safety, but he's in there safe so he's good to go," Combs said. 

Campbell also advises to never buy used car seats. For more car seat safety tips, click HERE

HCSO Safe Journey offer free car seat monthly at these locations: 

1st Tuesday 2-4 pm at Chuck E. Cheese, 22 Northgate Park, Hixson, TN 37343
2nd Tuesday 12-2 pm at Former KMART, 4801 Highway 58, Chattanooga, TN 37416
3rd Tuesday 12-2 pm at AAA Auto Club, 2111 Gunbarrel Road, Chattanooga, TN 37421
4th Tuesday 12-2 pm at Walgreens, 110 North Market Street, Chattanooga, 37405

You can also make an appointment by calling 423-893-3503, Option 3.