 alternating. So it's going to take an hour to get through that mess. Also, if you're heading west on US 50, slow down once you get past Eureka. The Mormon crickets are still a problem on US 50 west and 278 north of Eureka. Slow down because they are slicker and snot on a doorknob and you will slide off the road or get in an accident and you don't need that. You don't.