Welcome to the Highway 20 Auto. Were located on Highway 20 between Peosta and Dubuque. We offer a variety of services for truckers as well as the casual driver. The Highway 20 Auto/Truck Plaza is also home to the Speedway Diner and the C-store features the Speedway Deli Express.The Truck Stop has been in business for 22 years. Now under new ownership, Ron & Margie White have expanded, remodeled, and updated in the past year to bring a whole new look to the Truck Stop.