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When you set the traffic feature, the system examines traffic conditions and optimizes the route for the shortest time. If a severe traffic delay occurs while you are navigating, the system searches for a faster route. If it finds one, the system will automatically alter the route and display the reroute notification banner on the map screen.
The system may route you through a traffic delay if a better alternative route does not exist. The delay time is added into your estimated time of arrival automatically.