| # | Concept | Culture | Statement | Freq. |
|---|---|---|---|---|
| 1 | underground map | North America | Less commonly used due to reliance on cars and less extensive public transportation networks in many cities | 1 |
| 2 | underground map | North America | Less commonly used, as public transportation networks are not as extensive or relied upon for daily travel | 1 |
| 3 | underground tunnels | North America | Used for transportation and infrastructure, such as subways and utility tunnels | 1 |