broad road
逵 centers on a broad road or thoroughfare, a wide path for travel.
逵 combines the movement radical 辶 with 坴, which likely contributes the sound. The exact historical development is uncertain, but the character is associated with roads and pathways.
The movement radical 辶 suggests a path, and the inner part 坴 looks like a solid, wide mound. Imagine a broad road built on raised ground, wide enough for many travelers.
For キ, picture a key road that unlocks access to the city: key -> キ, and this broad road is the main key route.