What type of sign indicates that drivers should be cautious of oncoming speed restrictions?

The appropriate sign that indicates drivers should be cautious of oncoming speed restrictions is a speed limit sign. This type of sign is explicitly designed to inform drivers of the maximum permissible speed on a particular stretch of road. It serves as a warning and a guideline, helping to enhance road safety by setting clear expectations for speed limits.

In contrast, a yield sign instructs drivers to give way to oncoming traffic but does not convey information about speed limits. A stop sign indicates that drivers must come to a complete stop, but again, it does not provide any speed-related information. A no parking sign informs drivers about legal parking restrictions, which is unrelated to speed limits or driving speed. Understanding the role of speed limit signs is vital for maintaining safe conditions on the road.