Does the bus seem to be black?
Yes, the bus is black.
    src        edge_attr  dst
0     0   to the left of    3
1     0   to the left of    1
2     0   to the left of    5
3     1         carrying    5
4     1      in front of    3
5     1   to the left of    7
6     1   to the left of    6
7     1               on    4
8     1  to the right of    0
9     3   to the left of    6
10    3  to the right of    0
11    3           behind    1
12    3   to the left of    7
13    5  to the right of    0
14    6  to the right of    1
15    6  to the right of    3
16    6            above    7
17    7  to the right of    3
18    7  to the right of    1