With howitzers and helicopters, states trigger road-clearing avalanches
Many transportation agencies still use howitzers to set off avalanches to help keep roads safe, but they’re increasingly turning to high-tech explosive methods that can be safer and easier to use, such as fixed towers, explosives dropped by helicopter and remote-control systems that detonate compressed air and gases.
United States Washington Cascades Snoqualmie Pass Little Cottonwood Canyon Salt Lake Valley Steven Clark
Source: stripes.com