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Speed Management

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Speed Management Safety

Appendix A: Acknowledgments

This report is a result of FHWA's leadership in the area of speed management and toward creating effective resources for practitioners. FHWA project staff include the following:

  • Guan Xu | FHWA
  • Abdul Zineddin | FHWA
  • Norah Ocel | FHWA

The project team gratefully acknowledges the project Technical Advisory Committee (TAC) members who provided excellent guidance and support throughout this project. The TAC includes the following individuals:

6. Successful Strategies for Adoption of Safety Cameras

NEW YORK CITY, NEW YORK

ISSUESTRATEGIESTAKEAWAYS
  • Adoption of safety cameras is often difficult due to legislative and public concerns
  • Data-driven approach
  • Advocacy
  • Comprehensive approach
  • 63% decrease in speed
  • 55% decrease in fatalities

5. High Visibility Enforcement

CITY OF ORO VALLEY, ARIZONA

ISSUESTRATEGIESTAKEAWAYS
  • High crash urban intersections
  • Repeated distracted driver behavior leading to avoidable crashes
  • Negative public view of enforcement actions
  • High visibility enforcement advertised in advance
  • Educational messaging with every stop

4. Setting Credible Speed Limits

NEW HAMPSHIRE DOT

ISSUESTRATEGIESTAKEAWAYS
  • Legacy speed limits
  • Setting credible speed limits
  • Supporting local agencies
  • Coordination between DOT and local agencies
  • Engineering, enforcement, and educational approach
  • Team effort
  • Alignment of speed limits

3. Self-Enforcing Roadways

CITY OF GOLDEN, CO

ISSUESTRATEGIESTAKEAWAYS
  • Major community corridor with speeding and safety issues
  • Safety concerns for pedestrian and bicycles
  • Businesses were concerned with the impact of road modifications especially with roundabouts
  • Strategic approach with specific goals for all road users

2. Strategic Speed Management Program

CITY OF AUSTIN, TEXAS

ISSUESTRATEGIESTAKEAWAYS
  • Speeding is the top contributing factor in fatal crashes
  • Vulnerable road users are
  • overrepresented in severe crashes
  • Austin is experiencing significant population growth
  • Adopted a citywide vision zero goal
  • Identified leading causes of fatal and seriou

APPENDIX: CALCULATING INFERRED DESIGN SPEED FROM HORIZONTAL AND VERTICAL CURVATURE

HORIZONTAL CURVATURE

Given:

Designated Design Speed = 60 mph
Radius = 716.20 ft
Superelevation Rate = 6.6 %
e(max) = 8 %

Determine the inferred design speed based on Green Book criterion for horizontal curvature based on a method 2 distribution. The method 2 distribution assumes that all lateral acceleration is first used by the friction and the rest is distributed to the superelevation rate using the following equation:

REFERENCES

  1. American Association of State Highway and Transportation Officials, A Policy on Geometric Design of Highways and Streets, Washington, DC, 2004.
  2. Bowie, N. N., Jr. and M. Walz, "Data Analysis of the Speed-Related Crash Issue," Auto and Traffic Safety, Vol. 2, Winter 1994.
  3. U.K. Department of Transportation, Killing Speed and Saving Lives, London, 1987.
  4. Davis, G.