Final answer:
Warning signs should be posted at intervals of no more than 500 feet.
Step-by-step explanation:
In order for warning signs to be effective, they should be plainly displayed and easily readable from any approach to the perimeter from a reasonable distance. Additionally, they should be posted at intervals of no more than a certain number of feet. Although the exact distance can vary depending on local regulations and specific circumstances, a common recommendation is to post warning signs at intervals of no more than 500 feet.
This implies that signs need to be large enough and clear enough to be understood from the distance they are intended to be read. This concept is similar to determining how far away one should be from a car before it's safe to cross the street, which would depend on the individual's ability to judge distances and the speed of oncoming traffic. It's important to note that specific distances for warning signs should be obtained from relevant safety guidelines or regulations applicable to the situation being addressed.