What are TWO examples of transportation barriers in North America?

To be certain, the aging and inadequate transportation infrastructure is an issue for Americans up and down the economic ladder. Throughout the country highways are crumbling, bridges are in need of repair, and railways remain inadequate. Improvement to public transportation—buses, trains, and safer routes for bicycles—is something that just about everyone who lives in a major metropolitan area has on their wish list.

Explanation: CORRECT

  b.

there are isolated pockets of farming, generally around rivers and oases, which are used for irrigation.