1. An alternative path or course of travel that is not mandatory but available as a choice
The GPS offers an optional route through the scenic byway instead of the highway.
O GPS oferece uma rota opcional pela estrada panorâmica em vez da rodovia.
2. In navigation or logistics, a secondary route that users may select based on preference or circumstances
Drivers can take the optional route to avoid traffic congestion during rush hour.
Os motoristas podem seguir a rota opcional para evitar congestionamento durante a hora de pico.