Walks under Bridges. The criterion for providing walks at underpasses is basically
the same as described above for walks on bridges. An exception is that in
areas where there are no approach walks, space will be provided for future walks
but walks will not be constructed with the project unless there is substantial concurrent
approach walk construction. Where the approach walks at underpasses include
a tree lawn, the tree lawn width may be carried through the underpass wherever space
permits.