Final answer:
There is no standard reduction in miles per hour for work site speed limits below the maximum established speed limit for the area; it varies depending on local laws and the specific conditions of each work zone.
Step-by-step explanation:
Worksite speed limits are typically set to ensure the safety of workers and drivers in zones where road work or construction is taking place. It is important to adhere to these lower speed limits to prevent accidents and injuries. However, there is not a universal rule that work site speed limits are always a specific number of miles per hour below the maximum established speed limit for the area. The reduction in speed limit will vary based on local laws and regulations, and it may also depend on the type of road, the extent of the work being conducted, and other factors.
In some cases, like the example where 50 kilometers per hour is equal to approximately 31 miles per hour, this might be the set speed limit for a residential area, but that doesn't directly correlate to work site speed limits. Instead, traffic control plans for work zones will specify the speed limit based on an assessment of conditions. Therefore, one cannot state a blanket value such as 'work site speed limits are always ___ miles per hour below the maximum established speed limit' because it is subject to change and adjustment as per specific work zone requirements.