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  transit requests distance calculation via public transit routes (where available). This value may only be specified if the request includes an API key or a Google Maps Platform Premium Plan client ID. If you set the mode to transit you can optionally specify either a departure_time or an arrival_time. If neither time is specified, the departure_time defaults to now (that is, the departure time defaults to the current time). You can also optionally include a transit_mode and/or a transit_routing_preference.

 

  * Note: Both walking and bicycling routes may sometimes not include clear pedestrian or bicycling paths, so these responses will return warnings in the returned result which you must display to the user.