The document discusses the gridiron plan, a city plan where streets intersect at right angles to form a grid. It also mentions three city grids shown at the same scale with differences in their dimensions and layouts.

2.  Gridiron plan is a type of
city plan in which streets run
at right angles to each other,
forming a grid.

3.  three city grids at the
same scale showing
the differences in
dimensions and
configuration