# 14. How can I prioritize certain time slots?

Sometimes, customer experience takes priority over reducing kilometers or CO₂ emissions. For example, premium customers may require deliveries at specific times to ensure satisfaction—even if this results in longer routes.

To enforce these priority time slots in **TourSolver**, use the **Fixed Slot** constraint. This locks the specified time slot for the customer, ensuring they receive their delivery at the desired time.\
**Note:** Using Fixed Slot reduces flexibility for the optimization algorithm, as it limits route permutations. However, it guarantees that premium customers are served at the right time.


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