upload road network datasets (records the road network of the five cities.)

.gitattributes

@@ -61,3 +61,4 @@ pickup/pickup_hz.csv filter=lfs diff=lfs merge=lfs -text
 pickup/pickup_jl.csv filter=lfs diff=lfs merge=lfs -text
 pickup/pickup_sh.csv filter=lfs diff=lfs merge=lfs -text
 pickup/pickup_yt.csv filter=lfs diff=lfs merge=lfs -text
+road-network/roads.csv filter=lfs diff=lfs merge=lfs -text

road-network/roads.csv

@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:52d3f4ccf33a32cec42e2aa9f3083d8b2e79670b30bbd88f00f3fb9ad7979a0a
+size 231746519