The Oregon Department of Transportation says it will close Interstate 84 east of Troutdale if road conditions become unsafe during this weekend’s anticipated winter storm, and will keep it closed until it’s safe again for traffic.  An ODOT spokesperson says crews have been pre-treating area roads with deicer – magnesium chloride with rust inhibitor – in anticipation of the storm.  He adds will deploy as appropriate all available tools in its winter arsenal, including plows, sand, salt and deicer.  He also points out the more traffic stays off the road, the quicker roads can be cleared.  If you do drive, slow down, allow plenty of stopping distance and watch out for pedestrians and bicyclists because stopping distances are so much longer.