Traffic Network
Transportation Network
noun
You learned a while ago that 交通 means "traffic." So what would a traffic net be? A traffic network, or even a transportation network!
This is a jukugo word that uses the on'yomi readings of the kanji. You should be able to read this on your own.
大地震が首都圏の交通網を麻痺させました。
A massive earthquake paralyzed the transportation network in and around Tokyo.