> The same idea can be applied to package
> delivering, optimal route design, airborne disease diffusing model…

This all seems to getting close to breaching the terms of use by re-
purposing the Directions service?

> This can be done by perform several times of shortest path from center
> point and spread out to different directions.

Yes, here is fairly well-known implementation in v2 API
http://maps.forum.nu/gm_driving_radius.html

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