How does truck farming differ from market gardening?

In the context of vegetable farming, the primary distinction between market gardening and truck farming lies in the scale of production and the distance to the intended market.1

• Market Gardening: Traditionally, this involves producing an assortment of vegetables specifically for a local market. While the development of modern transportation has allowed some market gardeners to specialize in fewer crops, the practice remains centered on serving local demand.1
• Truck Farming: This method involves the extensive production of specific vegetables in relatively large quantities. These crops are grown in regions particularly suited to their culture and are intended for shipment to distant markets rather than local consumption.21

Historically, the distinction was clearer, but the rise of improved road networks and motor transport has blurred the lines, as market gardeners have gained the ability to reach broader areas and specialize their production similarly to truck farmers.1