Is the color of the meter different than the truck?
No, both the meter and the truck are black.
    src        edge_attr  dst
0     1   to the left of    2
1     2  to the right of    1
2     3               in    7
3     3   to the left of    4
4     3   to the left of    8
..  ...              ...  ...
70   23  to the right of   22
71   23  to the right of   19
72   24  to the right of    7
73   26   to the left of   13
74   26  to the right of   20

[75 rows x 3 columns]