Which material makes up the road that is dark, concrete or cobblestone?
The road is made of concrete.
    src        edge_attr  dst
0     0               of    5
1     1             near    5
2     1             near    3
3     1   to the left of    5
4     2   to the left of    5
5     3             near    1
6     3   to the left of    5
7     4   to the left of    7
8     4               of    1
9     4             near    5
10    5             near    1
11    5             near    4
12    5            above    6
13    5  to the right of    1
14    5  to the right of    7
15    5       driving on    6
16    5  to the right of    3
17    5  to the right of    2
18    7   to the left of    5
19    7  to the right of    4