It took a few days -- five, to be specific. But Texas Department of Public Safety, Dallas Police Department and Dallas North Tollway Authority authorities have issued a warning to folks driving along the Dallas North Tollway: Someone's throwing rocks off the Cedar Springs overpass. Turns out, it's been happening since Wednesday -- every day since Wednesday. Yesterday, someone had their windshield shattered by a falling rock; but other reports have it happening at least twice since the police started getting calls. No doubt, some folks who drive that route at least every single day (standing, hand raised, pointing to self) wouldn't have minded a heads-up, oh, Thursday? --Robert Wilonsky