Off? Neutral? Jam it into park? Always my first thought when I see these stories. I hadn't thought about the complications that could arise with lockouts/"safety" switches. Those are certainly viable options in my current (read older, cheap) fleet, maybe not so with newer cars?

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1980 300TD-China Blue/Blue MBTex-2nd Owner, 107K (Alt Blau) OBK #15
'06 Chevy Tahoe Z71 (for the wife & 4 kids, current mule) '03 Honda Odyssey (son #1's ride, reluctantly) '99 GMC Suburban (255K+ miles, semi-retired mule) 21' SeaRay Seville (summer escape pod)