 In Leg 3 and Leg 4 of Season 10 (Vietnam), all route markers were  white and yellow instead of red and yellow. This was done because  the flag of the vanquished South Vietnam also consisted of red and  yellow stripes. This is similar to Season 3s Leg 11 in which the  teams traveled through Ho Chi Minh City and Da Nang, however, the  route markers were made solid yellow in that season.