ODOT Travel Advisory.  Transportation:  ODOT: SW Oregon: Expect severe winter driving conditions in southern Oregon and northern California. I-5 Siskiyou Summit SB is still in full chain requirement, excluding 4x4s entering, into California. Caltrans is holding SB traffic at Weed. Southern Oregon Cascade mountain passes: expect blowing snow and high winds on OR 140, 66 and Dead Indian Memorial Road. Expect Delays and slow travel.