Handled OpenTripPlanner Error that a trip is unsafe.  In OpenTripPlanner, if a walking/transit trip starts in the middle of highway or another inaccessible place, an error is thrown saying that the trip is unsafe.  I worked around this problem by slightly adjusting the start/end points when this error is thrown until I find a safe starting and ending point.  It isn't a perfect solution, but it works for my current purposes.  A smarter solution would be to map the inaccessible points to the nearest accessible points. This is what google maps does in a similar situation.