APM: 74 Location: I-15 and Main St, Barstow Reassurance shield after the business route split. APM: 74 Location: I-15 and I-40, Barstow In 3/4 of a mile, we’ll approach SR 247. In the meantime, I-40 west traffic merges onto I-15 at the ramps on the right side of this picture. This is the western terminus of Interstate … Continue reading Interstate 15, I-15 Bus to I-40