New post on http://twitter.com/caltransdist3 : I-80: Big rigs are now cleared for travel over Donner Summit. EB/WB R-2 chain controls from Kingvale to Truckee. Please BeAlert and travel slowly as there will be many vehicles on the road today. Check http://Quickmap.dot.ca.gov for highway updates. http://pic.twitter.com/fhYDTxtjBs