maryland route 170 (md 170) is a state highway in the u.s. state of maryland. the state highway runs from md 175 in odenton north to md 2 in brooklyn park. md 170 connects the western anne arundel county communities of odenton and severn and the north county communities of linthicum, pumphrey, and brooklyn park with baltimore/washington international thurgood marshall airport (bwi airport). the highway connects bwi airport with interstate 695 (i-695) and md 100 and forms part of the airport loop, a circumferential highway that connects the airport and i-195 with many airport-related services.