When a powerful blizzard ripped through North Dakota last winter, hundreds of drivers were stranded as white-out conditions shuttered interstates spanning the state. Snow whipped up by wind marred the lines between pavement and grassy drop-offs, leaving some scared motorists unsure what to do. Two local software developers figured they could help. Bob Bertsch, an employee with the North Dakota State University Extension Service, and Jake Joraanstad, an NDSU computer engineering major, had just finished developing an app to help residents...