Parma

PARMA, Italy - It's a modern-day version of Marco Polo's journey halfway around the world - but is anyone at the controls? A team of Italian engineers on Tuesday launched what has been billed as the longest-ever test drive of driverless vehicles: a 13,000-kilometer (8,000-mile), three-month road trip from Italy to China, not in search of silk, but to test the limits of future automotive technology.