S AMP: 188 Location: I-25 and Poplar St, Casper As we enter the city of Casper, we’ll want to exit for WYO 220, which is the primary route west out of Casper towards Rawlins/Laramie/Salt Lake City/etc. It’s slightly surprising that it’s only signed as “Poplar Street” E to I-25 Bus/US-87 Bus, W to WYO 254 … Continue reading U.S. Route 20, I-25/US-87 to WYO 220