md 170 continues north as aviation boulevard and joins the airport loop. the highway parallels the amtrak's northeast corridor, which carries marc's penn line, and the hiker-biker bwi trail. md 170 meets the eastern end of stoney run road, which heads east and immediately loops back west and crosses over the state highway and the railroad on its way to the bwi car rental facility. the highway intersects unsigned md 995 (amtrak way), which leads to the bwi rail station serving amtrak and marc trains, as it gradually curves to the east. md 170 crosses kitten branch immediately before its partial cloverleaf interchange with the eastern terminus of i-195 and the northern terminus of md 995a (metropolitan boulevard). the highway passes under the bwi trail and expands to a divided highway before its intersection with terminal road and an at-grade intersection with mta maryland's baltimore light raillink. access to the rail line's bwi business district station is via elkridge landing road at the next intersection. md 170 leaves the airport loop at its intersection with md 162 (aviation boulevard), where the highway turns north onto camp meade road.