Who is on the barrier?
The people are on the barrier.
    src        edge_attr  dst
0     0   to the left of   12
1     0   to the left of    9
2     0   to the left of   14
3     0   to the left of    1
4     1   to the left of   10
5     1   to the left of   16
6     1  to the right of    0
7     2   to the left of   14
8     2   to the left of    4
9     2   to the left of    9
10    2   to the left of   15
11    2   to the left of   11
12    4   to the left of   11
13    4   to the left of    6
14    4   to the left of    5
15    4  to the right of    2
16    5  to the right of   11
17    5  to the right of    4
18    5  to the right of    6
19    6  to the right of    4
20    6               on   13
21    6   to the left of    5
22    7               on    4
23    7               on   13
24    7   to the left of   11
25    9               on    1
26    9   to the left of   14
27    9  to the right of   12
28    9   to the left of   16
29    9  to the right of    0
30    9  to the right of    2
31   10  to the right of    1
32   11   to the left of    5
33   11  to the right of    4
34   11  to the right of    7
35   11  to the right of    2
36   12   to the left of    9
37   12   to the left of   14
38   12     walking into   13
39   12  to the right of    0
40   13             near   14
41   14      standing on    9
42   14             near   13
43   14  to the right of    9
44   14  to the right of    2
45   14  to the right of   12
46   14   to the left of   15
47   14   to the left of   16
48   14     walking into   13
49   14  to the right of    0
50   15  to the right of    2
51   15  to the right of   14
52   15   to the left of   16
53   16  to the right of   15
54   16  to the right of   14
55   16               on    3
56   16  to the right of    9
57   16  to the right of    1
58   16       going down    3