zonal

adj

Etymology: First attested 1865–70, from zone + -al.

1. Divided into zones.

   “Decisions made at the DfT inevitably reflect a London-centric experience, with a comparison being made with the closure of ticket offices throughout the London Underground network. This is not judged to have been detrimental, but there is a simple zonal fares system that is hardly comparable with the range of ticket types used on the national rail network.”

2. Related to, associated with, or similar to zones.
3. roughly longitudinal (east to west, or west to east)