demo_2_route2_unswapped.tikz

\draw [gray, -latex] (0, 0) -- (3, 1);
\filldraw [gray] (0, 0) circle (2pt);
\draw [gray, -latex] (3, 1) --(2, 1);
\filldraw [gray] (3, 1) circle (2pt);
\draw [gray, -latex] (2, 1) --(1, 2);
\filldraw [gray] (2, 1) circle (2pt);
\draw [gray, -latex] (1, 2) --(1, 3);
\filldraw [gray] (1, 2) circle (2pt);
\draw [gray, -latex] (1, 3) --(0, 0);
\filldraw (1, 3) [gray] circle (2pt);
\filldraw [red] (0, 0) circle (4pt);