What vehicle is on the rectangular sign?
The vehicle is a bus.
    src        edge_attr  dst
0     0  to the right of    8
1     0   to the left of    6
2     0  to the right of    5
3     1  to the right of    2
4     1   to the left of    7
5     1   to the left of    6
6     1  to the right of   12
7     1  to the right of    9
8     1               by    7
9     1  to the right of    5
10    2   to the left of    1
11    3   to the left of    6
12    4  to the right of    5
13    4  to the right of   12
14    4   to the left of    6
15    5   to the left of    4
16    5   to the left of    0
17    5   to the left of    1
18    6  to the right of    1
19    6  to the right of    0
20    6  to the right of    3
21    6  to the right of    7
22    6  to the right of   10
23    6  to the right of    4
24    6  to the right of   11
25    7   to the left of    6
26    7  to the right of    1
27    7               on    3
28    8   to the left of    0
29    9               on   12
30    9   to the left of    1
31   10   to the left of    6
32   11   to the left of    6
33   12   to the left of    4
34   12   to the left of    1