Answer:
A, lane change clearance
Explanation:
Truck drivers use their lights to communicate with other drivers. If an approaching truck flashes you, it usually means danger ahead.
While you are overtaking a truck, a blink in the truck's lights means that you can safely pull in since there is a safe distance between you and the truck. Without the blink, you would have to judge the pulling in clearance yourself, which may be difficult sometimes, especially with very long, articulated trucks.
Flashing any kind of vehicle lights is prohibited in many countries.
I think the "it" is the Battle of Puebla, 5th May 1862, right?
The world power at the time was France, which was especially strong militarily, and was seen as one of the strongest armies at the time.
Answer: I think it is A, constitution
