Different weather events require the use of different techniques. The decision whether to salt or plow depends on the weather conditions. For example, if the temperature is below 20 degrees and not expected to rise, salt will not be effective. But if the sun is shining, and the temperature is 20 degrees or higher and expected to stay stead or rise, then salt would be more effective. Plowing under the wrong conditions can create a polished street surface, resulting in dangerous glare ice.