noun
traffic area; traffic block
A defined zone or block used in traffic planning, management, or analysis. Often used in technical or administrative contexts.
この交通圏では、朝夕の渋滞が特にひどい。
In this traffic area, morning and evening congestion is especially bad.
交通圏ごとに信号のパターンを変えている。
They change the traffic signal patterns for each traffic block.
Compound of 交通 (traffic) and 圏 (sphere, zone). The exact historical derivation is uncertain; the spelling is conventionally associated with the meaning.