A rotary is characterized by what feature?

Answer: B — central island

A rotary is characterized by a central island, which is a circular area in the middle that vehicles navigate around. This central island serves as the defining feature of a rotary, typically allowing traffic to move continuously in one direction around it. The island helps to organize traffic and reduce the likelihood of head-on collisions. In contrast, while rotaries may sometimes feature traffic lights, stop signs, or yield signs, these elements are not defining characteristics. They may be present in various types of traffic control at intersections but do not specifically identify the rotary's function or structure. The presence of a central island is what fundamentally distinguishes a rotary from other roadway designs, making it crucial for effective traffic flow and management.