Le Tour de France
On this chall we are given a picture of a road sign that we need to locate:
A quick search on google map by typing E17 E21 besançon we find a link to E17 & E21
Heading to street view, we can find the signs:
Looking at the url we can see 47.0150657,4.8676532 and we then need to truncate this to the hundreds, the flag is then 404CTF{47.01,4.86}