SALEM, OR — For most drivers, the two-hour stretch of perfectly straight I-5 between Eugene and Portland is a test of mental endurance. But for 34-year-old Springfield resident Laura Jenkins, it’s the highlight of her week. “This is my me time,” Jenkins said, leaning against her Subaru Outback at a Salem rest stop. “Just me, the road, and endless fields of grass that could be the same field over and over for all I know. It’s pure bliss.” Friends describe Jenkins as a “thrill seeker” who finds...