Logistic Zones Improvement → A new zone type for "overlapping"

Currently we have:

Default → Assigned trucks cannot enter any zone.
Zones → Normal logistics zones (Zone Layer 1).

Suggestion: Add a new zone type:

Over-Lap → A dedicated Zone Layer 2 that allows trucks to cross Zone Layer 1 boundaries while remaining within their Layer 2 area. Buildings cannot be assigned to Over-Lap zones—they exist solely to define cross-zone vehicle movement, while still allowing assigned trucks to interact with buildings in their primary Layer 1 zone.
(A perfect use case for amphibious vehicles or bridge-crossing haulers.)

Why?
Using overlapping normal zones already achieves this behavior, but introduces potential building conflicts (especially for mods). You may not want every building assigned to a full-map zone, and vehicles assigned to those buildings effectively belong to multiple zones when, ideally, they should only belong to their primary Layer 1 zone. This can also complicate vehicle recovery behavior & gas-stations not assigned to to a logistic route.

Here's an example where the current workaround conflicts with how a modded Parking Lot building is intended to work:
(The Parking Lot pulls in distant trucks from the overlapping zone, when ideally it should only interact with trucks assigned to its primary Zone Layer 1.)
https://coigame.com/Topic/1504/Distribution-of-Trucks-among-Garages-in-different-Logistics