- Depth: Lower anchors should be located no more than 3/4 inch deep in the seat bight and should be easy to see.
- Clearance: Nothing should obstruct access to the anchors. Safety belt buckles and other hardware plus the foam, cloth or leather material of the seats themselves shouldn't get in the way of attaching child seat connectors. There should be enough room around the anchors to approach them at an angle, as well as straight-on. This makes it easier to hook or snap on connectors and also tighten LATCH straps.
- Force: Parents should be able to install child restraints using less than 40 pounds of force. Some systems require lots of effort to properly attach child seat hardware with lower anchors, in part because they are deep in the seat bight or surrounded by interfering parts of the vehicle seat.
For the complete list of what IIHS determined were the easiest and hardest to use LATCH systems, visit the IIHS study here.
Source: IIHS, Nissan