Nearly 20 years ago, a firefighter in Kentucky lost control of his personal vehicle while driving over a large pool of water and, in course of the crash, sustained fatal injuries.
By now, it should be no surprise that a tight turn, even at a low speed, can generate enough lateral g-force to roll an apparatus onto its side. To understand this concept better, let’s examine two scenarios.
I do not use case studies to attack, ridicule, or otherwise demean anyone who may have been involved in an actual incident. Instead, I am simply trying to demonstrate the concepts and theories that we have been discussing over the past few months in a real-life environment.
To understand how curve advisory speeds are calculated, we need to understand several issues related to road design. Keep in mind that this article is not meant to be an engineering class. Instead, we will touch on a few keys points and discuss curve advisory speeds in simple terms.