The influence of speed limits on roadway safety has been a subject of continuous debate in the St... more The influence of speed limits on roadway safety has been a subject of continuous debate in the State of Indiana and nationwide. In Indiana, highway-related accidents result in about 900 fatalities and forty thousand injuries annually and place an incredible social and economic burden on the state. Still, speed limits posted on highways and other roads are routinely exceeded as individual drivers try to balance safety, mobility (speed), and the risks and penalties associated with law enforcement efforts. The speed-limit/safety issue has been a matter of considerable concern in Indiana since the state raised its speed limits on rural interstates and selected multilane highways on July 1, 2005. In this paper, the influence of the posted speed limit on the severity of vehicle accidents is studied using Indiana accident data from 2004 (the year before speed limits were raised) and 2006 (the year after speed limits were raised on rural interstates and some multi-lane non-interstate routes). Statistical models of the injury severity of different types of accidents on various roadway classes were estimated. The results of the model estimations showed that, for the speed limit ranges currently used, speed limits did not have a statistically significant effect on the severity of accidents on interstate highways. However, for some non-interstate highways, higher speed limits were found to be associated with higher accident severitiessuggesting that future speed limit changes, on non-interstate highways in particular, need to be carefully assessed on a case-by-case basis.
This paper presents a statistical analysis of commuters' route choice behavior and the influence ... more This paper presents a statistical analysis of commuters' route choice behavior and the influence of traffic information. The analysis is based on a 1992 computer-aided telephone interview survey of Los Angeles area morning commuters. The results underscore the important relationship between the use of traffic information and the propensity to change routes. In addition, important relationships are uncovered relating the influence that commuters' socioeconomic characteristics and the level of traffic congestion they face have on traffic information use and route-change frequency. The results' important implications for advanced traveler information systems (ATIS) development are discussed.
ABSTRACT The effectiveness of pavement overlays and pavement replacements in terms of their impac... more ABSTRACT The effectiveness of pavement overlays and pavement replacements in terms of their impact on pavement life is not well understood. This is complicated further by data collection limitations and by the effect that physical deterioration, load volumes, weather, geology, and other factors may have on their effectiveness. Understanding the survivability of overlays and replacements has the potential to provide improved resource allocation and more effective use of state funds. In this paper, pavement overlays and replacements are assessed for their effectiveness on pavement life for urban roads. Using data from Indiana, seemingly unrelated regression equations first are estimated to predict the pavement performance over time. Using these forecasts and historical thresholds, the service life of the pavement is determined and random parameter duration models are estimated to identify influential factors affecting pavement service life. The model-estimation results provide some new insights into the interrelationships among pavement rehabilitation, pavement condition, pavement service life, road functional class, traffic loads and trucks, weather and soil condition, and rehabilitation expenditures. (C) 2014 American Society of Civil Engineers.
Increased traffic congestion in the United States has been magnified by shortfalls in transportat... more Increased traffic congestion in the United States has been magnified by shortfalls in transportation funding, which have limited government agencies' ability to adequately maintain existing trans portation facilities, implement new policies, expand existing facilities, and construct new ...
The pavement analysis in this study considers various combinations of pavement rehabilitation tre... more The pavement analysis in this study considers various combinations of pavement rehabilitation treatments (two-course HMA overlay with or without surface milling, concrete pavement restoration, three-course HMA overlay with or without surface milling, three-course HMA overlay with crack and seat of PCC pavement and 3-R and 4-R overlay or replacement treatments). Six road functional classes (rural and urban of interstates, non-interstates
Brookings Papers on Economic Activity. Microeconomics, 1991
Brand Loyalty and the Decline of American Automobile Firms DESPITE RECORD profits in 1988, the Am... more Brand Loyalty and the Decline of American Automobile Firms DESPITE RECORD profits in 1988, the American automobile industry is in serious decline and could face a financial crisis during the 1990s.
... AND FRED L. MANNERING VN Shankar, RB Albin, and JC Milton, Washington State Department of Tra... more ... AND FRED L. MANNERING VN Shankar, RB Albin, and JC Milton, Washington State Department of Transportation, Transportation Building, Room 2B, Olympia, WA 98504. FL Mannering, Department of Civil Engineering, University of Washing-ton, Seattle, WA 98195. ...
This paper explores the driving public's attitude toward acceptable levels of road roughness usin... more This paper explores the driving public's attitude toward acceptable levels of road roughness using empirical data collected on urban highways. Individual driver acceptability levels are matched with International Roughness Index (IRI) levels to examine the existence of potential user acceptability thresholds. In particular, the observed trends are compared with the federal IRI guideline of 170 in/mi (2.68 m/km) for "acceptable ride quality," recommended by the Federal Highway Administration (FHWA) in its 1998 National Strategic Plan for the National Highway System (NHS). This paper provides empirical support for the current recommended guideline. The research seems to provide the empirical support for the federal IRI guidelines that are already in existence. This study also found that IRI levels provided a very good indication driver acceptability, which agrees with past research based on antiquated present serviceability ratings (PSR).
The influence of speed limits on roadway safety has been a subject of continuous debate in the St... more The influence of speed limits on roadway safety has been a subject of continuous debate in the State of Indiana and nationwide. In Indiana, highway-related accidents result in about 900 fatalities and forty thousand injuries annually and place an incredible social and economic burden on the state. Still, speed limits posted on highways and other roads are routinely exceeded as individual drivers try to balance safety, mobility (speed), and the risks and penalties associated with law enforcement efforts. The speed-limit/safety issue has been a matter of considerable concern in Indiana since the state raised its speed limits on rural interstates and selected multilane highways on July 1, 2005. In this paper, the influence of the posted speed limit on the severity of vehicle accidents is studied using Indiana accident data from 2004 (the year before speed limits were raised) and 2006 (the year after speed limits were raised on rural interstates and some multi-lane non-interstate routes). Statistical models of the injury severity of different types of accidents on various roadway classes were estimated. The results of the model estimations showed that, for the speed limit ranges currently used, speed limits did not have a statistically significant effect on the severity of accidents on interstate highways. However, for some non-interstate highways, higher speed limits were found to be associated with higher accident severitiessuggesting that future speed limit changes, on non-interstate highways in particular, need to be carefully assessed on a case-by-case basis.
This paper presents a statistical analysis of commuters' route choice behavior and the influence ... more This paper presents a statistical analysis of commuters' route choice behavior and the influence of traffic information. The analysis is based on a 1992 computer-aided telephone interview survey of Los Angeles area morning commuters. The results underscore the important relationship between the use of traffic information and the propensity to change routes. In addition, important relationships are uncovered relating the influence that commuters' socioeconomic characteristics and the level of traffic congestion they face have on traffic information use and route-change frequency. The results' important implications for advanced traveler information systems (ATIS) development are discussed.
ABSTRACT The effectiveness of pavement overlays and pavement replacements in terms of their impac... more ABSTRACT The effectiveness of pavement overlays and pavement replacements in terms of their impact on pavement life is not well understood. This is complicated further by data collection limitations and by the effect that physical deterioration, load volumes, weather, geology, and other factors may have on their effectiveness. Understanding the survivability of overlays and replacements has the potential to provide improved resource allocation and more effective use of state funds. In this paper, pavement overlays and replacements are assessed for their effectiveness on pavement life for urban roads. Using data from Indiana, seemingly unrelated regression equations first are estimated to predict the pavement performance over time. Using these forecasts and historical thresholds, the service life of the pavement is determined and random parameter duration models are estimated to identify influential factors affecting pavement service life. The model-estimation results provide some new insights into the interrelationships among pavement rehabilitation, pavement condition, pavement service life, road functional class, traffic loads and trucks, weather and soil condition, and rehabilitation expenditures. (C) 2014 American Society of Civil Engineers.
Increased traffic congestion in the United States has been magnified by shortfalls in transportat... more Increased traffic congestion in the United States has been magnified by shortfalls in transportation funding, which have limited government agencies' ability to adequately maintain existing trans portation facilities, implement new policies, expand existing facilities, and construct new ...
The pavement analysis in this study considers various combinations of pavement rehabilitation tre... more The pavement analysis in this study considers various combinations of pavement rehabilitation treatments (two-course HMA overlay with or without surface milling, concrete pavement restoration, three-course HMA overlay with or without surface milling, three-course HMA overlay with crack and seat of PCC pavement and 3-R and 4-R overlay or replacement treatments). Six road functional classes (rural and urban of interstates, non-interstates
Brookings Papers on Economic Activity. Microeconomics, 1991
Brand Loyalty and the Decline of American Automobile Firms DESPITE RECORD profits in 1988, the Am... more Brand Loyalty and the Decline of American Automobile Firms DESPITE RECORD profits in 1988, the American automobile industry is in serious decline and could face a financial crisis during the 1990s.
... AND FRED L. MANNERING VN Shankar, RB Albin, and JC Milton, Washington State Department of Tra... more ... AND FRED L. MANNERING VN Shankar, RB Albin, and JC Milton, Washington State Department of Transportation, Transportation Building, Room 2B, Olympia, WA 98504. FL Mannering, Department of Civil Engineering, University of Washing-ton, Seattle, WA 98195. ...
This paper explores the driving public's attitude toward acceptable levels of road roughness usin... more This paper explores the driving public's attitude toward acceptable levels of road roughness using empirical data collected on urban highways. Individual driver acceptability levels are matched with International Roughness Index (IRI) levels to examine the existence of potential user acceptability thresholds. In particular, the observed trends are compared with the federal IRI guideline of 170 in/mi (2.68 m/km) for "acceptable ride quality," recommended by the Federal Highway Administration (FHWA) in its 1998 National Strategic Plan for the National Highway System (NHS). This paper provides empirical support for the current recommended guideline. The research seems to provide the empirical support for the federal IRI guidelines that are already in existence. This study also found that IRI levels provided a very good indication driver acceptability, which agrees with past research based on antiquated present serviceability ratings (PSR).
Uploads
Papers by Fred Mannering