AMP: 119 Location: I-15 and Broadway St, Idaho Falls No reassurance shield after US-20 merges onto I-15, because we’re just about to exit. AMP: 119 Location: I-15 and US-20, Idaho Falls Exit for US-20, which heads northeast as an expressway to Rigby and Rexburg, eventually heading to W. Yellowstone, MT.  E to US-20 Bus, W to US-26 … Continue reading U.S. Route 20, I-15/I-15 Bus/US-20 Bus to I-15