Are there any yellow traffic lights or fire hydrants?
No, there is a fire hydrant but it is red.
    src        edge_attr  dst
0     2               on    1
1     2   to the left of    5
2     2  to the right of    4
3     3               on    1
4     3   to the left of    6
5     4   to the left of    5
6     4               on    1
7     4   to the left of    2
8     5  to the right of    2
9     5               on    1
10    5  to the right of    4
11    6               on    1
12    6  to the right of    3
13    9               on    1