HallsofIvy : I see what you mean. If you were to aim directly at your destination and cause space to expand, it would be pointless. Everything along this hypothetical corridor would be pushed apart. My thought is to aim to the side of your destination (and not at anything important behind you)...
From what I understand, space (not matter) can expand at a speed faster than that of light, and when it does, it goes in all directions. Would it be possible to create a controlled expansion of space behind a vehicle along a single path, like a corridor, that would change your position in space...