One limitation is you have to be able to speak English or you will have difficulty reading the clue in front of the cameraman. :(
Also, I think they should just get the first four winning teams from TAR 1, 2, 3, and have a special edition of TAR instead of having celebrity on the show. They would definitely have a huge advantage because everywhere they go, people know them and would probably help them a lot in the race, which is not something I want to see. :nono
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