Your child restraint must be tightly locked in place at all times during travel. Prior to installing your car seat using your vehicle seat belts, you will need to know how to lock the seat belt. Please refer to your car seat and vehicle manufacturer owner's manuals for model-specific installation information (vehicle seat belts that will not work with your child's car seat as well as helpful information regarding seating positions, retractors & latch plates for securing car seats). The section on vehicle seat belt use with child restraints in your vehicle owner’s manual is your best source for information concerning your vehicle and manufacturer requirements/restrictions.
Please Note: Not all vehicle belts will work with all car seats.