Tradeoffs among free-flow speed, capacity, cost, and environmental footprint in highway design

This paper investigates differentiated design standards as a source of capacity additions that are more affordable and have smaller aesthetic and environmental impacts than modern expressways. We consider several tradeoffs, including narrow versus wide lanes and shoulders on an expressway of a given total width, and high-speed expressway versus lower-speed arterial. We quantify the situations in which off-peak traffic is sufficiently great to make it worthwhile to spend more on construction, or to give up some capacity, in order to provide very high off-peak speeds even if peak speeds are limited by congestion. We also consider the implications of differing accident rates. The results support expanding the range of highway designs that are considered when adding capacity to ameliorate urban road congestion.

[1]  M. Hadi,et al.  ESTIMATING SAFETY EFFECTS OF CROSS-SECTION DESIGN FOR VARIOUS HIGHWAY TYPES USING NEGATIVE BINOMIAL REGRESSION , 1995 .

[2]  M. Baucus.  Transportation Research Board , 1982 .

[3]  Ps Hu.  SUMMARY OF TRAVEL TRENDS: 2001 NATIONAL HOUSEHOLD TRAVEL SURVEY , 2004 .

[4]  Dominique Lord,et al.  Does Separating Trucks from Other Traffic Improve Overall Safety , 2005 .

[5]  Samuel G Charlton,et al.  Explicit and implicit processes in behavioural adaptation to road width. , 2006, Accident; analysis and prevention.

[6]  A Downs,et al.  THE LAW OF PEAK-HOUR EXPRESSWAY CONGESTION , 1962 .

[7]  Kara M. Kockelman,et al.  Safety Effects of Speed Limit Changes: Use of Panel Models, Including Speed, Use, and Design Variables , 2005 .

[8]  C. Fuhs,et al.  Active Traffic Management: The Next Step in Congestion Management , 2007 .

[9]  Robert B Noland,et al.  The effect of infrastructure and demographic change on traffic-related fatalities and crashes: a case study of Illinois county-level data. , 2004, Accident; analysis and prevention.

[10]  Michael J. Cassidy,et al.  Increasing Capacity of an Isolated Merge by Metering its On-Ramp , 2004 .

[11]  Ezra Hauer,et al.  Methodology to Predict the Safety Performance of Urban and Suburban Arterials , 2007 .

[12]  W Reilly,et al.  HIGHWAY CAPACITY MANUAL 2000 , 1997 .

[13]  Tomer Toledo,et al.  Impact of Active Speed Limiters on Traffic Flow and Safety , 2007 .

[14]  Seiji S.C. Steimetz,et al.  Defensive driving and the external costs of accidents and travel delays , 2008 .

[15]  A. Downs.  Stuck in Traffic: Coping with Peak-Hour Traffic Congestion , 1992 .

[16]  M. Cassidy,et al.  Some traffic features at freeway bottlenecks , 1999 .

[17]  Karen R. Richard,et al.  Relationship of Lane Width to Safety on Urban and Suburban Arterials , 2007 .

[19]  P. S. Hu,et al.  Summary of Travel Trends , 2004 .

[20]  Mark Vandehey,et al.  Default Values for Highway Capacity and Level-of-Service Analyses , 2008 .

[21]  Ronghui Liu,et al.  Network effects of intelligent speed adaptation systems , 2004 .

[22]  K Close,et al.  AMERICAN ASSOCIATION OF STATE HIGHWAY AND TRANSPORTATION OFFICIALS COMPUTER SYSTEMS INDEX , 1976 .

[23]  K. Small,et al.  The economics of urban transportation , 2007 .

[24]  A. Pisarski.  Commuting in America II: The Second National Report on Commuting Patterns and Trends , 1996 .

[25]  S. Emerson,et al.  AASHTO (American Association of State Highway and Transportation Officials). 2001. A Policy on Geometric Design of Highways and Streets. Fourth Edition. Washington, D.C. , 2007 .

[26]  Lena Winslott Hiselius,et al.  Estimating the relationship between accident frequency and homogeneous and inhomogeneous traffic flows. , 2004, Accident; analysis and prevention.

[27]  D. Scrafton.  Still Stuck in Traffic: Coping with Peak-hour Traffic Congestion, Anthony Downs, Brookings Institution Press, Washington, D.C., 2004, ISBN 0 8157 1929 9, xi + 455 pages, (pbk), £19.50, $28.95 , 2005 .

[28]  Samantha L Comte.  New systems: new behaviour? , 2000 .

[29]  Fred L. Mannering,et al.  The relationship among highway geometrics, traffic-related elements and motor-vehicle accident frequencies , 1998 .

[30]  S. Peltzman.  The Effects of Automobile Safety Regulation , 1975, Journal of Political Economy.

[31]  A. C. Pigou.  Economics of welfare , 1920 .

[32]  J E Curren.  Use of shoulders and narrow lanes to increase freeway capacity , 1995 .

[33]  John N. Ivan,et al.  Designing Roads that Guide Drivers to Choose Safer Speeds , 2009 .

[34]  黒田 孝次,et al.  Highway Capacity Manual改訂の動向--テイラ-教授の講演より , 1984 .

[35]  John F. Kennedy.  Economic report of the President : transmitted to the Congress, January 1963 . Together with the annual report of the Council of Economic Advisers , 1962 .

[36]  Karin M Bauer,et al.  Safety Effects of Narrow Lanes and Shoulder-Use Lanes to Increase Capacity of Urban Freeways , 2004 .