When your car has 5-inch thick military grade armor, is biochemically sealed, has its own oxygen supply, and can fire tear gas and infrared smoke grenades, it's easy to assume you're driving the perfect urban tank. Unfortunately, as US president Barack Obama - and his presumably red-faced driver - discovered in Dublin, Ireland today, all of that clever kit makes your car surprisingly heavy, too, and simple speed bumps become a whole lot more treacherous.
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