Ever wondered why “No U-Turn” signs are posted at median crossovers on controlled-access highways such as Interstate 10? This video shows just how dangerous it is to slow down abruptly from highway speeds to turn into the median. In this case, the driver of a tractor-trailer was passing another vehicle in the left lane when the pickup truck ahead of him hit the brakes to turn into a marked “No U-Turn” area. Fortunately, the driver of the tractor-trailer was able to brake quickly enough to avoid