Several options were considered, including dualization of the tunnels, addition of two lanes through a large road cut in the mountain, leaving the other two lanes in the tunnel, and replacement of the entire tunnel with an open cut to the north.
12.
Together with an important generalization, "'Schunck classes "', and an important dualization, "'Fischer classes "', formations formed the major research themes of the late 20th century in the theory of finite soluble groups.
13.
Dualization of MD 97 in Montgomery County was extended further north from MD 28 to MD 108 by 1989 . There are plans to build an interchange at the route s intersection with Randolph Road in order to improve movements for automobiles as well as for pedestrians and bicycles accessing the nearby Glenmont Metro station.
