Just north of MD 158, MD 151 has a partial interchange with I-695 (Baltimore Beltway), which includes a ramp from MD 151 to northbound I-695 and a loop ramp from southbound I-695 to MD 151.
The intersection of MD 151 and I-695 (Baltimore Beltway) is partially connected, featuring ramps for traffic traveling in both directions.  A northbound ramp connects MD 151 to the Beltway, while a southbound loop ramp provides access from I-695 to MD 151.