Do the barrier and the fire hydrant have a different colors?
Yes, the barrier is red and the fire hydrant is white.
    src        edge_attr  dst
0     0   to the left of    4
1     0  to the right of    6
2     0  to the right of    1
3     1   to the left of    0
4     1  to the right of    6
5     4  to the right of   10
6     4  to the right of   11
7     4  to the right of    9
8     4  to the right of    0
9     4  to the right of    7
10    4  to the right of   13
11    4  to the right of   12
12    4  to the right of   14
13    4  to the right of    8
14    6   to the left of    0
15    6   to the left of    1
16    7   to the left of    4
17    8   to the left of    4
18    9   to the left of    4
19   10   to the left of    4
20   11   to the left of    4
21   12   to the left of    4
22   13   to the left of    4
23   14   to the left of    4