What is the purpose of a sign that instructs drivers to keep to the right of an island or divider?

Answer: B — To guide traffic safely around obstacles

The purpose of a sign instructing drivers to keep to the right of an island or divider is to guide traffic safely around obstacles. Such signs are typically placed in areas where there may be physical barriers or traffic islands to ensure that vehicles navigate safely and smoothly. By directing drivers to keep to the right, the sign helps maintain an organized flow of traffic, preventing collisions and confusion that could arise from vehicles attempting to navigate through or around these obstacles in an unsafe manner. This guidance is especially crucial in busy areas where congestion may already be a concern. In contrast, indicators for lane changes, passing areas, or parking are unrelated to the primary function of such a sign, which is to enhance safety and traffic management around fixed objects in the roadway.