Half a million trucks carry food on America's roads every day, sometimes traveling for thousands of miles to get produce to market. To better appreciate the time and effort this journey demands, Dan and Spencer follow one truck on a 3,200-mile road trip, from a strawberry field in California to a grocery store in Washington, D.C.

Click here to learn more about food's epic journey to America's tables.

By 2050 we'll need to feed two billion more people. Click here for a special eight-month series exploring how we can do that—without overwhelming the planet.

Onward is a project to explore the world and share its untold stories. Click here to hit the road with National Geographic multimedia journalists Spencer Millsap and Dan Stone. Or tweet them at @spono and @danenroute to join the conversation.

Half a million trucks carry food on America's roads every day, sometimes traveling for thousands of miles to get produce to market. To better appreciate the time and effort this journey demands, Dan and Spencer follow one truck on a 3,200-mile road trip, from a strawberry field in California to a grocery store in Washington, D.C.

Click here to learn more about food's epic journey to America's tables.

By 2050 we'll need to feed two billion more people. Click here for a special eight-month series exploring how we can do that—without overwhelming the planet.

Onward is a project to explore the world and share its untold stories. Click here to hit the road with National Geographic multimedia journalists Spencer Millsap and Dan Stone. Or tweet them at @spono and @danenroute to join the conversation.