The Vance Model is best known for explaining the relationship between transportation and:

The Vance Model, also known as the Vance Model of Product Life Cycle, is best known for explaining the relationship between transportation and economic development.

Here's a step-by-step explanation:

1. The Vance Model was developed by James Vance, a geographer, who was trying to understand how transportation systems influence the economic development of a region.

2. According to the model, a region's economic development is influenced by its transportation system. This is because transportation systems determine how easily goods can be moved from one place to another.

3. The model suggests that regions with well-developed transportation systems are likely to experience faster economic growth because they can more easily trade with other regions.

4. On the other hand, regions with poor transportation systems may struggle to grow economically because it's harder for them to trade with other regions.

5. Therefore, the Vance Model is best known for explaining the relationship between transportation and economic development.