On what slope is the grader restricted from working?

The correct answer regarding the slope that a grader is restricted from working is 3:1. This slope is a critical parameter in road grading and excavation because it determines the stability and safety of the operation. A slope of 3:1 means that for every three units of horizontal distance, the elevation changes by one unit. This slope allows for adequate stability and balance for the grader while performing its tasks.

Graders are designed to operate effectively within certain limits to ensure safety and prevent accidents during grading operations. Steeper slopes can increase the risk of tipping and may hinder the grader's ability to perform its intended functions effectively, such as maintaining control and precision in grading tasks. Hence, the restriction at the 3:1 slope is in place to promote safety while maintaining operational integrity.

In contrast, slopes like 2:1 are steeper and may pose higher risks, while slopes like 4:1 and 5:1 are less restrictive and generally safer for the operation but do not represent the specific limitation placed on grader operations. Thus, understanding these slope ratios is crucial for determining safe working conditions for graders.