It's not a first without the butter: > San Francisco-based self-driving truck startup Embark Trucks, which last year completed a five-day, 2,400-mile cross-cou

It's not a first without the butter: > San Francisco-based self-driving truck startup Embark Trucks, which last year completed a five-day, 2,400-mile cross-country trip. But that truck carried no freight. Still, you'd think they'd ship something in abundant supply in California and short supply in Pennsylvania. Optimism, maybe.