Is the road red or gray?
The road is gray.
    src        edge_attr  dst
0     0   to the left of    5
1     0   to the left of    4
2     1   to the left of    3
3     2   to the left of    7
4     2   to the left of    3
5     3  to the right of    2
6     3  to the right of    1
7     4  to the right of    0
8     5               of    4
9     5  to the right of    0
10    6     covered with    8
11    6               on    3
12    7               on    1
13    7  to the right of    2
14    8               on    6