sentences:  Of all vehicle miles traveled in the United States, 22% are driven on backroads, but 43% of vehicle collisions in 2015 (15,132 out of 35,092) occurred on backroads.In 2015, Texas had the highest number of rural non-interstate traffic deaths at 1,259, with California in second place at 1,219 deaths.Backroads tend to have narrow lanes, limited or non-existent shoulders, inconsistent pavement with gravel patches, sharp curves, steep slopes, and poor visibility.