What is NOT a consideration when deciding between using ordinary rock salt and a mixture of salt and calcium chloride for treating icy roads?

When determining the best method for treating icy roads, the type of road—whether it is a main or secondary road—does not influence the choice between ordinary rock salt and a mixture of salt and calcium chloride. Other considerations, such as the weather forecast, the effectiveness of each option at below-zero temperatures, and the potential for damage to vegetation, are critical factors that can significantly affect the effectiveness and environmental impact of the chosen treatment.

The weather forecast is essential in assessing temperature trends and precipitation, which can inform how quickly and effectively the chosen treatment will work. Similarly, the effectiveness of rock salt versus a salt and calcium chloride mixture can vary based on temperature; calcium chloride performs better in extremely low temperatures, making it a suitable choice when sub-zero conditions prevail. Lastly, consideration of environmental impact, including the potential for damage to vegetation, is increasingly important for maintaining ecological balance while effectively managing icy road conditions. Therefore, the type of road is a less critical factor in this context.