sentences:  When the routes intersect I-270, I-55 stays on its own pavement using the mileposts from the Poplar Street Bridge, while I-70 heads east on I-270's pavement using I-270's mileposts.Because of this, when I-55/70 intersects I-270 from the southeast, the exit numbers are 20 A-B, when I-70 intersects I-55/270 from the east, it is exits 15 A–B.I-70 was rerouted from the Poplar Street Bridge to the Stan Musial Veterans Memorial Bridge north of downtown St. Louis, which opened in February 2014.