This document discusses ice warning systems for runways. It summarizes that ice warning systems allow for 24/7 monitoring of runways which can optimize flight safety and winter maintenance. Data from the systems can be used to minimize inspections and organize them more efficiently. The systems combine passive and active sensors to measure factors like surface temperature, freezing point, and chemical concentrations to determine runway conditions. An all-in-one weather station can also monitor additional weather parameters. Several airports and military bases in Germany, Italy, and Turkey utilize these ice warning systems.