What is the requirement for the placement of Speed Limit Signs with a yellow background?

The placement of Speed Limit Signs with a yellow background is specifically designed to enhance safety by providing clear, visual indications of speed restrictions that protect the affected tracks. By placing these signs in one direction, they effectively warn operators and ensure compliance with speed limits on sections of track where conditions may require reduced speeds. This strategic positioning helps maintain safe operations by alerting train crews to potential hazards or changes in conditions ahead.

In contrast, other options do not accurately reflect the specific guidelines set forth for the placement of these signs. For example, requiring signs on both sides with enough distance may be excessive in situations where directional signage is sufficient to convey the necessary information. Similarly, while speed limit signs are important, placing them at the beginning of every track section or only at high-traffic stations does not address the need for targeted warnings in specific areas where speed limits are critical for safety. Thus, the requirement focuses on the directional protection of affected tracks, ensuring that trains are appropriately advised of speed restrictions as they approach those areas.