The Oregon and Washington transportation departments have extended studded tire season in the two states until the end of the day on April 15.   Travelers normally can use studded tires from November 1 through March 31.  State laws grant each state’s transportation department the ability to extend the studded tire season when necessary based on projected weather forecasts.  ODOT Maintenance and Operations Engineer Luci Moore says the forecast suggests mountain passes will receive some significant snow in the next few weeks, but they do ask if you don’t plan to travel in those areas, don’t wait until the last minute to remove studded tires.  This is only the fifth time in the past 16 years that ODOT has extended the studded tire season past March 31.  Three of those extensions occurred from 2010 to 2012.