Yosemite Mac Calendar.app travel time feature isn't compatible with Google Calendar

Travel Time for Appointments in Apple Calendar (Yosemite) is a nice feature, but it’s not compatible with Google Calendar. I suspect travel time is an attribute of the appointment, not a separate appointment, and it’s not a standard CalDAV feature.

So if you’re using iOS or OS X Calendar.app with a Google Calendar back end don’t bother with this feature. 

Is kind of nifty I admit.