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Yeah, that’s a really tricky situation, one in which you sometimes don’t have much time (sunrise is only so long!), or many chances, to experiment.
Speaking purely from personal experience, if you really want to completely “freeze” a vehicle, wheels and all, that’s moving at, let’s say, 100 km/h (60 mph), you’re going to have to use a shutter speed of at least 1/500th of a second. In your second shot, you’d have needed either a much higher ISO or a much larger aperture (probably the first, given it’s a landscape shot.)
Since vehicles typically aren’t going to be going much faster than that, I’d suggest starting at that speed and working your way down, 1/500, 1/400, 1/300, etc. until you find the ‘sweet spot’ balancing exposure and motion blur. Keep a sharp eye on your image previews on-camera, watching for motion blur on the wheels and bumpers. Use time-priority mode (Speed priority on Nikon) and automatic ISO–but keep an eye on it!–if possible.
As an aside, in some cases (see attached), you’ll find that a slower shutter speed, coupled with a steady hand, can make for some pretty awesome shots. This was shot at 1/60th second, in full sunlight. The wheels (obviously) are blurred out, but the rest is quite sharp.
-William Frazer