
An extra danger lurks above when visiting national parks in winter and spring.
Icicles might look pretty dangling from overhangs, caves, waterfalls, and tunnel entrances but they can cause injury to people and hazards to drivers.
Shenandoah National Park recently posted this warning to social media: "Icicles can be exciting to view as they seem to drip frozen in time. However, icicles will eventually fall; never linger underneath an area with heavy icicles. When they do fall, ice can collect on the road underneath. If you see ice on the road, reduce speed, maintain plenty of distance from other vehicles or consider using lower gear."
The post reminded drivers to be especially aware of icicles and ice on the road at the park's Marys Rock Tunnel on Skyline Drive. The tunnel, located at mile 32 just south of the Thornton Gap entrance station, is an iconic landmark along the route and is considered one of the park's greatest engineering feats. It was built in 1932.
While there is no official database of incidents related to icicles, a report from Cleveland Clinic says they can cause cuts or head injuries. They are most likely to fall when temperatures fluctuate widely or thaw, according to the report.
Skyline Drive, including Marys Rock Tunnel, sometimes closes due to winter weather. The entire 105-mile scenic highway was shut down by a storm in January.
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