KDOT has also released information on their use of rock salt and salt brine. Plow operators may apply salt brine or rock salt behind them to help promote melting. However, rock salt and salt brine generally don’t work when temperatures are near or below 15° F. Rock salt can be used alone or in combination with sand to help with traction, but, on a very cold road, wind and gusts from passing vehicles can blow these materials off the road. Salt brine is most effective if it is applied before icing. Bridges cool faster than the rest of the roadway, so they maybe the first places to develop a stubborn icy surface. Road crews may add extra salt and sand on bridges to help with traction, but drivers should add extra caution.