Banking of roads is the phenomenon of…… outer edge of the road…… the inner edge.

Explanation

**Step-by-Step Solution:**

1. **Understanding the Concept of Banking of Roads**:
- Banking of roads refers to the design of curved roads where the outer edge is elevated compared to the inner edge. This design helps vehicles navigate turns more safely.

2. **Identifying the Key Elements**:
- In the context of banking, the outer edge of the road is raised to create an angle with the horizontal. This angle helps in providing the necessary centripetal force for vehicles making a turn.

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