A fence is designed to keep something in, or out, and dirt is one of those. Big metal fences can accomplish this but are costly. Silt fences are the solution. Stretches of the same dust barrier material for chain link fences set on wooden stakes makes silt fences a very cost effective solution when the dirt or dust is the only concern.
Silt fences can be used for other purposes, such as events or temporary small job site fencing. Silt fences cost makes them an affordable solution, but they do not have the durability or strength of any other type of fencing, making them a very short-term solution. The cost, however, can make them a long term solution because the fencing can often be replaced for less than orange plastic fencing, the next cost effective fencing.