KanjiJLPT N5
Traffic

traffic, pass through, avenue, commute, counter for letters, notes, documents, etc.

Mnemonic

A massive cauldron tumbles off a cart and lands in the middle of the path, instantly creating a traffic jam. Horns blare, pedestrians swarm. Eventually people learn to stream around the cauldron like a roundabout, and traffic flows smoothly once more.
Additional thoughts
Picture a steaming iron cauldron sitting dead-center on a busy road. The path curves around it. The image of obstruction turning into flow mirrors how traffic works — constant adaptation to keep things moving.
Quick recall
A cauldron blocks the path, spawning a huge traffic jam until everyone flows around it.

Details

The keyword for 通 is traffic. This kanji conveys the idea of passing through, going along a road, or commuting — essentially the movement and flow associated with traffic. It extends beyond literal vehicular movement to encompass broader meanings such as communication, being well-versed in something, or the general concept of passage and accessibility. At its core, it represents the unobstructed flow of people, goods, or information from one point to another.
On'yomi
つう、つ
Kun'yomi
とお.る、とお.り、-とお.り、-どお.り、とお.す、とお.し、-どお.し、かよ.う