variable-width medians and independent profiles may be used for the two roadways.
Narrow medians with a barrier (barrier medians) are normally used in urban areas.
Under normal design, the median width will vary depending on the width of the barrier
and the shoulder width required (Table 2.23).
Types. Medians are divided into types depending upon width and treatment of the
median area and drainage arrangement. In general, raised or barrier medians are applicable
to urban areas, while wide, depressed medians apply to rural areas. Figure 2.27
shows examples. Medians in rural areas are normally depressed to form a swale in the
center and are constructed without curbs. The type of median used in an urban area