Is the bridge made of the same material as the pole?
No, the bridge is made of concrete and the pole is made of metal.
    src        edge_attr  dst
0     0   to the left of    7
1     0  to the right of   14
2     0   to the left of   15
3     0  to the right of    6
4     1   to the left of    2
5     2  to the right of    1
6     3   to the left of    4
7     3               on   11
8     3  to the right of   17
9     4  to the right of   11
10    4  to the right of    3
11    4  to the right of   17
12    6   to the left of   13
13    6   to the left of   15
14    6   to the left of    0
15    7  to the right of    0
16    9  to the right of   16
17    9   to the left of   17
18    9   to the left of   13
19   10   to the left of   13
20   10  to the right of   17
21   10   to the left of   15
22   10  to the right of   14
23   11  to the right of   14
24   11  to the right of   17
25   11   to the left of    4
26   12               on   13
27   13  to the right of    6
28   13  to the right of   10
29   13  to the right of   14
30   13  to the right of    9
31   14   to the left of   11
32   14   to the left of    0
33   14   to the left of   10
34   14   to the left of   13
35   14   to the left of   15
36   15  to the right of    0
37   15  to the right of   14
38   15  to the right of   10
39   15  to the right of    6
40   16   to the left of   17
41   16   to the left of    9
42   17  to the right of    9
43   17   to the left of    3
44   17   to the left of    4
45   17  to the right of   16
46   17               of    4
47   17   to the left of   11
48   17   to the left of   10