Many incidents, such as weather and road closures, have effects on the transportation system that extend beyond the state border. The California/Oregon Advanced Transportation Systems (COATS) effort has, since 1998, provided a key venue for using technology to coordinate highway operations across the state border and minimize the effects of these larger events on the traveling public. Efforts need to continue in the future to ensure that the transportation system responds effectively to weather and other incidents, even across a state border.