When stopped behind a school bus you cannot continue moving
a. you cannot see any more children getting on or off the bus
b. you access to a passing lane
c. the bus stops flashing it's red light and (if applicable) withdrawls it's stop sign

entering that problem on the tube you may come up with an answer

answer: ensure protection from communism

explanation:

the north atlantic treaty was largely dormant until the korean war initiated the establishment of nato to implement it, by means of an integrated military structure: this included the formation of supreme headquarters allied powers europe in 1951, which adopted the western union's military structures and plans.