街道

1. Origins, structure, and basic meaning

• Structure: 街道 (かいどう) combines settlement or street 街 with road 道 for a major route, often a historic highway.
• Basic usage: It refers to an old arterial road linking regions, post towns, or mountain routes.

2. Common pitfalls and similar expressions

• A historic route, not necessarily an expressway
  • 街道 often carries historical and geographical context and does not by itself mean a modern controlled-access highway.