Before revision: Although often used interchangeably, the terms directional boring and horizontal directional drilling are distinct in that they convey a different sense of scale.
After revision: PR-277-144507-Z01 Installation of Pipelines by Horizontal Directional Drilling Engineering Design Guide (Arlington, VA: Pipeline Research CouncilInternational, Inc., 2015)Although often used interchangeably, the terms directional boring and horizontal directional drilling are distinct in that they convey a different sense of scale.