Dust storms occur quite frequently in New Mexico. They are the result of when powerful winds pick up large quantities of very dry (and thus, easy to particulate) exposed surface soil and obscures visibility as depicted in Figure NM -1. The low visibility detection system installed along Interstate 10 (I-10) at the southwest corner of New Mexico in
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The Michigan Department of Transportation (MDOT) spends roughly $100 million on winter maintenance each season. This represents approximately forty percent of its total maintenance budget. With this significant expenditure, there is a need to find an effective performance measure that will allow MDOT to evaluate the effectiveness of changes to its
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The Montana Department of Transportation (MDT) provides extensive traveler information to Montana’s driving public. This information includes winter roadway conditions, highway construction projects, road closures, accident and incident reports, load and speed restrictions, and a variety of other traveler information.
One of the biggest challenges for road weather management along Interstate 10 (I-10) is dust storms. Currently, in the spring of each year these often unpredictable events wreak havoc on travel along I-10. Dust storms are an important safety concern in the region, especially for out-of-state drivers who are unfamiliar with this phenomenon. These du
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California’s Great Central Valley suffers from Tule fog. It is a thick ground fog which reduces visibility to one hundred feet or less that settles in the San Joaquin Valley and Sacramento Valley areas of California's Great Central Valley. Tule fog forms during the late autumn and winter (California's rainy season) after the first significant rainf
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Fredonyer Pass, located in northeastern California, is a five-mile segment of State Highway 36 in Lassen County that has a history as a high-collision location, including multiple fatal crashes involving local residents. The vast majority of these crashes (note in this document, the terms crash and collision may be used interchangeably) occurred wh
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Many agencies continue to be challenged with removing snow on an increasing number of lanes and shoulders with the same or fewer trucks and operators, while still needing to meet the public’s expectations. There is a necessity to identify how to plow wider and faster to maintain or increase services without adding personnel. The Colorado Department
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The Florida Department of Transportation (FDOT) has deployed a high-wind alert system for road bridges. The system assists the transportation and public-safety communities by providing real-time wind speed status information during severe weather events from each monitored bridge structure. This information is used to assist transportation managers
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Colorado State Highway 82, in Snowmass Canyon (between Aspen, CO and Glenwood Springs, CO) is composed of an elevated southbound roadway that shades the northbound roadway during certain times of the day causing rapidly changing freezing conditions. The Colorado Department of Transportation (CDOT) installed the Variable Speed Management System whic
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The Idaho Transportation Department (ITD) is in the final stages of developing its Winter Maintenance Performance Measures System which will include 87 Road Weather Information System (RWIS) sites. At the time of publication, sixty sites are operational. Statewide implementation of the system began in 2011. Currently, ITD is identifying the perform
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Spreading salt on road surfaces is one of the primary means for removing and preventing accumulation of snow and ice. The Iowa Department of Transportation (Iowa DOT) has a new management dashboard featuring actual salt usage during maintenance operations compared to estimated usage amounts, based on road weather conditions. Managers monitor this D
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The Iowa Department of Transportation’s (Iowa DOT) “Weatherview” website is an example of real-time road weather information provided for the traveling public. “Weatherview” was made available online in 1999. The current site was released in 2009. Subsequently, it has been updated to incorporate road cameras, traffic flow information, and maintenan
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John A. Volpe National Transportation Systems Center (U.S.)
2012-01-01
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Highlights the range of PEL activities undertaken by FHWA in FY12, including technical assistance, training, outreach and communication. In addition, information on FHWA's vision for PEL activities in Fiscal Year 2013 is provided.
United States. Department of Transportation. Federal Highway Administration. Office of Highway Policy Information
2012-01-01
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The data in these State by State Abstracts contain State-submitted data to FHWA on: motor fuel use, driver licensing, vehicle registration, State and local financing, land area, population, and vehicle miles of travel.
United States. Department of Transportation. Federal Highway Administration. Office of Highway Policy Information
2012-01-01
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The data in these State by State Abstracts contain State-submitted data to FHWA on: motor fuel use, driver licensing, vehicle registration, State and local financing, land area, population, and vehicle miles of travel.
The Alaska Department of Transportation and Public Facilities (ADOT&PF) has developed an effective seasonal weight restriction program that uses temperature data probe (TDP) profiles as one tool to issue fact-based weight restriction notices. TDP sensors deployed at strategic locations provide a vertical temperature profile in the six foot layer be
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In March 1995 a fog-related crash involving 193 vehicles occurred on the seven-mile (11.3 kilometer) Bay Bridge on Interstate 10. This crash prompted the Alabama Department of Transportation (DOT) to deploy a low visibility warning system. The warning system was integrated with a tunnel management system near Mobile, Alabama.
In December of 1973, the segment of Interstate 75 near Calhoun, Tennessee, was opened to traffic. Following this date, multiple vehicle accidents occurred due to visibility problems experienced in foggy conditions. The culmination of these events occurred on December 11, 1990 when dense fog contributed to a series of chain-reaction collisions invol
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The Vermont Agency of Transportation (VTrans) Transportation Operations Center (TOC) is the focal point for VTrans’ Intelligent Transportation Systems (ITS) road weather management and traveler information systems operations. TOC staff are responsible for monitoring various ITS devices statewide, communicating with VTrans’ road crews, public safety
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Transportation agencies, which are responsible for providing safe, reliable highways throughout the winter season, face significant challenges: Travelers and commercial carriers with demanding delivery schedules expect higher levels of service. Transportation agencies have limited funding and staff. Reliable site- and time-specific reports of road
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