Two north-metro interstate highways were snarled for hours Tuesday, one by a head-on crash and the other by a spectacular truck fire. The crash, in a construction zone along Interstate 35E just south of the Forest Lake split, happened shortly before 1:30 p.m. Three people suffered noncritical injuries, said State Patrol Lt. Eric Roeske. Just a few minutes after that accident was reported, a commercial truck caught fire on I-35W in Roseville, closing westbound Hwy. 36 and northbound I-35W, Roeske said. Also shut down was access to 35W from Cleveland Avenue. Both ramps were reopened by early evening. No injuries were reported. PAUL WALSH