United States Department of Transportation
i
Signing strategies for low-water and flood-prone highway crossings.
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2011-11-01
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[PDF-14.91 MB]
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Abstract:"In Texas, approximately eight flood-related fatalities occur each year—the majority of these (78.6 percent)
involve motorists that are trapped in their vehicles or washed away. In many cases, victims, not wanting to
take a lengthy detour, ignored barricades and tried to drive across a flooded street or low-water crossing—
literally driving themselves into harm’s way. It takes as little as 2 ft of water to float most cars. Several
districts in Texas have developed different signing strategies for warning motorists of low-water crossings.
As part of this research, the Texas Transportation Institute (TTI) developed guidelines and
recommendations for creating signing uniformity for low-water and flood-prone sections of roadways.
Signing guidelines were created for the following situations: 1) roadway sections that have several lowwater
crossings where water flows over the roadway in wet conditions, 2) actual low-water crossings, and 3)
temporary road closures due to high water. TTI also developed criteria for when to implement active waterlevel
detection and advance warning systems at low-water crossings and flood-prone roadway sections."
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