Originally Posted by railroadtycoon
Are you sure they weren't there before January? I'm looking at photos off the net of Shibuya crossing (some taking back in 2004-2005) and the marks appear there as well.
I've got a photo from October (2005) that my Dad took and they don't show up in there. Oh wait, yes they do... I can just make them out

. Wrong yet again! Sorry!!!
Anyway, I'm completely mistaken about how recently the red lines appeared - I must have taken much more notice the first couple of times I went there - 2002. Certainly weren't any red markings the time I scooped up hundreds of pachinko balls from the 'gutter'.
This is what they
used to look like:
http://p.vtourist.com/853660-Shibuya_crossing-Tokyo.jpg
I'm still interested if anyone knows the answers!
EDIT: thanks
railroadtycoon! Looks like I've gotten a general answer as to when they appeared (BTW - I think they were filming Lost in Translation when I was there on my first visit, if so, the Typhoon that affected their shooting was the one that hit Tokyo on the 1st October 2002. I obviously didn't pay that much attention when I was scooping those balls in May 2003 after all

)