What kind of vehicle is on the street?
The vehicle is a bus.
    src        edge_attr  dst
0     1  to the right of   14
1     1  to the right of   15
2     1  to the right of   13
3     3               on    4
4     5  to the right of   13
5     5  to the right of   18
6     6   to the left of    7
7     6  to the right of    9
8     6  to the right of    8
9     6   to the left of   12
10    6  to the right of   11
11    7  to the right of    6
12    7  to the right of    8
13    7  to the right of    9
14    8   to the left of    6
15    8   to the left of    7
16    8   to the left of    9
17    8  to the right of   10
18    8  to the right of   11
19    8   to the left of   12
20    9   to the left of   12
21    9  to the right of   11
22    9  to the right of   10
23    9  to the right of    8
24    9   to the left of    7
25    9   to the left of    6
26   10   to the left of    9
27   10   to the left of   11
28   10   to the left of    8
29   11  to the right of   10
30   11   to the left of    8
31   11   to the left of    9
32   11   to the left of    6
33   12  to the right of    9
34   12  to the right of    6
35   12  to the right of    8
36   13   to the left of    5
37   13   to the left of    1
38   13  to the right of   15
39   13  to the right of   14
40   13  to the right of   17
41   14   to the left of   13
42   14  to the right of   17
43   14   to the left of   18
44   14   to the left of    1
45   14   to the left of   15
46   15  to the right of   14
47   15   to the left of   13
48   15   to the left of    1
49   17   to the left of   13
50   17               on   10
51   17   to the left of   14
52   18   to the left of    5
53   18  to the right of   14