Trains were a major form of travel in the state in the early 20th-century, but by 1921, North Carolinians owned over 136,000 automobiles. The most popular car was the Model-T, because of its reasonable price and reliability. North Carolina dirt roads, however, often impassable in wet weather. Turner discusses the work of Harriet Berry, whose work in the 1920s led to legislation that created all-weather roads in the state. As the decade closed, another type of transportation emerged -- the airplane.