Which method is typically NOT effective for controlling noise pollution?

Raising speed limits in residential areas is typically not effective for controlling noise pollution because increasing vehicle speed generally leads to higher noise levels. In residential areas, the objective is usually to minimize disturbances to the community and enhance the quality of life.

Unlike methods such as installing sound barriers or using noise-reducing pavement, which are designed to absorb or deflect sound, raising speed limits would likely contribute to increased traffic noise due to faster-moving vehicles. Planting trees along highways can also help reduce noise to some extent, as vegetation can act as a buffer and absorb sound, although its effectiveness may vary based on the type and density of the plantings.

In summary, raising speed limits contradicts the goals of noise control strategies, as it would typically increase noise pollution rather than decrease it.