Negotiations are now going on with the companies, hoping they can voluntarily give up their activities before 2020.

When negotiations start we are hoping that we can find something that would benefit [Union Pacific] so we can have something mutually beneficial. We have a good relationship with Union Pacific so we're hoping to build on that relationship as we move into negotiation.

vacate the premises both voluntarily and expeditiously.

He's testifying now, and is doing so voluntarily.

I deployed voluntarily for Katrina.

We're exempted, but we're voluntarily doing it.