Temporary speed reductions in East Idaho as spring breakup approaches EAST IDAHO (KIFI) – Update: ITD has plans to reconstruct a section of ID-33 from the US-20/ID-33 intersection to Newdale starting this summer with plans to be completed by this fall. ORIGINAL: Recent winter storms and fluctuating temperatures have caused potholes to develop along roadways in Eastern Idaho. ITD will begin temporarily reducing speed limits on several local highways in East Idaho beginning March 12 to protect vehicles and preserve roads from further damage. The speed limit will be lowered to 55 mph on the following highways March 12: US-20 from Chester to Ashton