A huge shipment of oilfield equipment that's been heading toward Idaho for several days now is ready to enter the state.  The 450 ton "megaload," is headed for the Canadian tar sands oil development.  It’s  been delayed by protests and bad weather in Eastern Oregon. The load was given permission for a daylight run Tuesday, traveling 50 miles on a stretch at elevations above 4,000 feet where the state said ice could be a factor after dark. Thursday

, the load was getting close to Vale, Oregon, just across the Idaho border.  On Monday, 16 people were arrested near John Day, Oregon.Environmentalists tried to block the rig, contending tar-sands development will contribute to global warming.