lattice work on front and sides
軨 centers on a lattice or railing structure attached to the front and sides of a vehicle, specifically a carriage or cart. The meaning is narrow and technical, referring to this particular wooden framework.
軨 combines 車 (vehicle) with 令, which likely provides the sound. The character specifically denotes a lattice or railing on a carriage.
The left side 車 is a vehicle, and the right side 令 looks like a person under a roof. Imagine a carriage with a lattice railing where a person (令) can lean safely while riding.
For レイ, picture a lattice railing on a carriage that is laid out in a neat pattern: lay -> レイ, and the lattice is laid across the front and sides.