BEDFORD, Pennsylvania — For the briefest of moments, a line of vintage Rolls-Royce automobiles chugged along the curving Cumberland Road. They passed over the Cumberland Run a handful of times and wound themselves down the mountains, away from Pennsylvania and toward the city of steeples, Cumberland. The sight gives the bystander a moment to imagine what it looked like in the early days of American road tripping.These 1922 Rolls-Royce vehicles, which included the New Phantom and the Silver Ghost (some of the first cars designed expressly to be owner-driven rather than chauffeured), were not what any Americans owned. But they help you understand what men like Henry Ford knew: no matter what class you fell in, everyone wanted the freedom and adventure that automobiles provided.The vintage convoy of luxury automobiles passing leisurely down the road exemplified just that. Just watching the joy the occupants had with their tops down, scarves flowing in the crisp mountain breeze, waving to farmers along the way, was a reminder that Americans still love their cars and road trips. They still do, more than 100 years after the first assembly line was introduced in 1913 and massive scaling made automobiles affordable to most people.