已经开发了几种不同的公路下水平穿越方法。这些方法所需的工作区域、涉及的劳动力和操作所需的设备各不相同。讨论了使用气动钻机、气动穿孔工具、箱孔螺旋钻和推拉机进行湿式钻孔的应用。此外，还介绍了一种高性能埋地管道和电缆定位工具的新开发，该工具能够准确读取按钮深度。

Several different methods of horizontally crossing under highways have been developed. The working area required, labor involved and equipment needed for operation varies widely between these methods. Wet boring with the use of air-powered drills, air-powered piercing tools, case bore auger machines, and pusher/puller applications are discussed. Also presented is a new development of a high performance buried pipe and cable location tool that is capable of accurate push button depth readouts.