Is there no way to put iOS devices into a debug mode and send fake location data? Android has supported that for a while, and it's much nicer than actually driving around.
You can definitely create any number of locations and switch around between them in the Simulator, triggering the significant location change notification without driving around town. Although in their story it was the chatting-while-driving that actually led to finding the problem.
Significant location changes weren't enough to trigger the bug by themselves. If you try it in the simulator and no joy, it's natural to go out and try the real thing to be sure.