md 170 is a part of the national highway system from its southern terminus in odenton to i-695 in linthicum. within that stretch, there are two sections that serve as intermodal passenger transport links: from its southern terminus to md 32 in odenton, and from md 176 to md 162 along the perimeter of bwi airport. the portions from md 32 in odenton to md 176 in severn and from md 162 to i-695 within linthicum are national highway system principal arterials.