How Does Salt Melt Ice? (Video) (IMAGE) American Chemical Society Caption Winter weather can mean treacherous driving across much of the country. Road crews spread rock salt all over the highways and byways, but why? This week, Reactions breaks down the chemistry that keeps the roads safe when bad weather hits. Check out the video here: http://youtu.be/JkhWV2uaHaA. Credit The American Chemical Society Usage Restrictions None License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.