When Tornadoes Are Near, States Flash Warnings on Digital Billboards (pewtrusts)
When a tornado was barreling toward Oklahoma City earlier this month, some motorists in the area may not have known of the possible danger. But if they were driving on the highways, they could have been alerted by any one of two dozen large, multicolored digital billboards flashing warnings. […]
pewtrusts.org
Thu, May 21, 2015 at 3:21 PM
Thu, May 21, 2015 at 3:21 PM