At the beginning of the twenty-first century, some people placed signs with crudely painted skeletons holding cell phones near roadways, usually facing freeway ramps. These signs indicated disapproval of using cell phones while driving, a practice some states have now made illegal. As a result of these laws an informal has become a law.

The answer is norm.

Refer below for the explanation.

Explanation:

Therefore,

At the beginning of the twenty-first century, some people placed signs with crudely painted skeletons holding cell phones near roadways, usually facing freeway ramps. These signs indicated disapproval of using cell phones while driving, a practice some states have now made illegal. As a result of these laws an informal norm has become a law.

Norm is a pattern or a general rule.

carefully examine the map above. based on your knowledge of colonialism in africa, the area attributed to belgium on this map is most likely the democratic republic of the congo.