Notify the user, when the user goes in wrong direction (Google Directions API)

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If you are using Google's Direction API, it easy fairly easy to determine whether a user is following the route or not.
If the user fails to follow the path, the user can be notified and given the right instructions to remain on the path. Most of the time, the user gets a new route, i.e. the route changes.
It can be implemented as below.

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