We were driving on US 20 between Fairfield and Mtn Home, ID and pulled over because an Ace hardware semi was bearing down on us. He passed us and then proceeded to TWICE try to pass 3 trucks in front of us near a curve. He had to pull back in the first time and the second time had to wedge between two pick up trucks. There was a large semi type truck pulling farm type equipment in front but he wasn't going that slow and we were only 10 mikes or so from I-84.very dangerous. Truck number was 4912 and license plate was Washington 0958-ZP. Not worth it. Hope You don't expect your drivers to drive like that.