Every sidewalk I saw in China had these same grooves right in the middle. Couldn't for the life of me figure out what they were for. Ted Rattei clarified that they are for people who are blind, so they can follow the sidewalk safely using only their feet to tell where they are. Clever!
May 04, 2015@02:15

K5__0655
1/30 sec at f / 4.0@28 mm
ISO 6400
PENTAX K-5
smc PENTAX-DA* 16-50mm F2.8 ED AL [IF] SDM