What is the primary purpose of reflective road markers?

The primary purpose of reflective road markers is to guide drivers and mark road boundaries in low visibility conditions. These markers are designed to reflect light, making them visible in darkness or during poor weather conditions such as rain, fog, or snow. By outlining the edges of the road or indicating where lanes are, reflective road markers help maintain safe navigation, especially when visibility is compromised. Their reflective nature enhances driver awareness of the road's boundaries, leading to safer driving experiences.

The other options do not align with the fundamental role these markers play on the road. For instance, while speed limits and exit signs are important for traffic management, they serve different purposes and are typically indicated through signage rather than reflective markers. Similarly, providing directions to nearby cities involves road signs that convey information about distances and routes, rather than the visual guidance that reflective markers provide on the road itself.