BURIED ALIVE

摘要

Let's just say it right from the start-loops are an incredibly accurate and efficient way to detect vehicles. For decades now, loops have been the standard to which all other detection has been compared. Traffic specifications are written around them, because well-tuned loops provide the high level of accuracy required by almost every facet of traffic management and planning. But loops are far from perfect. When it comes right down to it, loops aren't always as accurate as everyone thinks, especially when they are poorly tuned or trying to detect vehicles that change lanes. Buried in the road, loops are subjected to a harsh environment that can be exasperated by freeze/thaw cycles, road surface damage or even changes to a roadway's configuration. They are difficult to install and maintain, and the process requires lane closures that disrupt traffic and put road workers in danger. They have a high failure rate, and maintaining or replacing loops can be costly.