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Evaluation of Countermeasures: A Study on the Effect of Impactable Yield Signs Installed at Intersections in San Francisco

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  • Banerjee, Ipsita
  • Ragland, David R.

Abstract

The present study evaluated the effect of impactable signs that used the yield-symbol as approved by the National Committee on Uniform Traffic Control Devices (NCUTCD) in the 2003 Manual of Uniform Traffic Control Devices (MUTCD). Impactable yield signs are low- costsignsconstructed of flexible material. The signs wereinstalled in the medians adjacent to crosswalks at selected non-signalized intersections to instruct drivers to yield the right-of-way to pedestrians. This paperexamines the effect on safety characteristics of the intersections of these signs at three stop-sign controlled intersections in San Francisco over two follow up periods. Since these signs were installed recently, there were no post-installation crash data for comparison with the pre-installation crash data.As such, surrogate measures, including (a) driver yielding behavior, (b) conflicts among drivers and pedestrians crossing the intersection, (c) waiting time for pedestrians, and (d) time taken by pedestrians to cross a given crosswalk were documented. Previous studies have indicated that impactable yield signs are effective in increasing the rate of drivers yielding to pedestrians. Video recordings were taken at the intersection pre- and post-installation to observe any changes in behavior. Analyses of these recordings yielded data for baselineand the first and second follow-up periods respectively. Testing the first and second follow-up data against the baseline data reveal that, a substantial increasein yielding behavior by drivers occurred immediately after installationas well as during the second follow-up period. No significant effect was observed in any other variables.

Suggested Citation

  • Banerjee, Ipsita & Ragland, David R., 2007. "Evaluation of Countermeasures: A Study on the Effect of Impactable Yield Signs Installed at Intersections in San Francisco," Institute of Transportation Studies, Research Reports, Working Papers, Proceedings qt61k2k9bz, Institute of Transportation Studies, UC Berkeley.
    • Handle: RePEc:cdl:itsrrp:qt61k2k9bz
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    File URL: https://www.escholarship.org/uc/item/61k2k9bz.pdf;origin=repeccitec
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    References listed on IDEAS

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    1. Ragland, David R & Markowitz, Frank & MacLeod, Kara E, 2003. "An Intensive Pedestrian Safety Engineering Study Using Computerized Crash Analysis," Institute of Transportation Studies, Research Reports, Working Papers, Proceedings qt871767fh, Institute of Transportation Studies, UC Berkeley.
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    Cited by:

    1. Hua, Jenna & Gutierrez, Nicolas & Banerjee, Ipsita & Markowitz, Frank & Ragland, David R, 2009. "San Francisco PedSafe II Project Outcomes and Lessons Learned," Institute of Transportation Studies, Research Reports, Working Papers, Proceedings qt5kn520zb, Institute of Transportation Studies, UC Berkeley.

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    1. Hua, Jenna & Gutierrez, Nicolas & Banerjee, Ipsita & Markowitz, Frank & Ragland, David R, 2009. "San Francisco PedSafe II Project Outcomes and Lessons Learned," Institute of Transportation Studies, Research Reports, Working Papers, Proceedings qt5kn520zb, Institute of Transportation Studies, UC Berkeley.

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