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Capacity and Level of Service at Unsignalized Intersections Final Report Volume 2 - All-Way-Stop-Controlled Intersections (1996) / Chapter Skim
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Chapter Six. Service Time
Pages 51-56

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From page 51...
... This measurement error must be considered when assessing the quality of the forecasts described in subsequent sections of He chapter. THEORETICAL MODEL TESTING Theoretical input values, over a wide range of traffic conditions, were used to determine if the computational procedure yielded logical results.
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From page 52...
... Effect of Conflicting Volume on Departure Headway Case 5 Headway Analysis IN US I 0 500 1000 Opposing Volume Fig'~ 19. Effect of Opposing and Conflicting Volumes on Departure Headway MODEL TESTING WITH FIELD DATA Forecasts of ache service time (the forecast value of the departure headway minus the move-up dme)
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From page 53...
... Table 70. Model Forecast Errors Groups 2, 3, and 4 Sites AU Data 0.77 NWA402 0.81 NWA406 0.60 NWA407 0.99 SEA101 0.94 SEA1OS 0.3S SWA002 1.39 SWA004 1.77 SWA008 1.34 SWAOO9 0.60 19.2% 12.6% 10.6% 27.1% 20.3% 10.1% SS.7% 39.S% 2S.1% 21.7% 1.29 0.99 1.81 1.05 1.12 0.46 1.74 1.77 1.43 0.70 Note: My= mean absolute fores error,lL4PE= mean absolute percent error, SE= standard forecast error.
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From page 54...
... Service Time Forecast, Validation Sites Table 72. Model Forecast Errors, Validation Sites All Data 1.4 Is 3O/~ ~ s Note: ~ = mean absolute forecast e'ror, M 4PE = mean absolute percent e'ror, By= standard error ofthe forecast FINDINGS AND RECOMMENDATIONS The analysis presented here supports a number of significant findings with respect to a decision on an appropriate capacity mode} for AWSC intersections.
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From page 55...
... Recommendations The service time mode] , an ex ensign of Capacity Mode} 2, is recommended as the basis for the new capacity estimation procedure to be included In the next edition of the HCM.
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Key Terms

  • mean absolute
  • forecast error
  • time forecast
  • absolute percent
  • forecast errors

  • percent error
  • absolute forecast
  • model forecast
  • standard forecast
  • senice time

  • single lane
  • field measurements
  • lane sites
  • validation sites
  • standard error

  • vehicle tom
  • measurement error
  • equal values
  • ofthe forecast
  • measured values

  • connecting equal
  • proposed service
  • line connecting
  • saturation headway
  • time model

  • time based
  • headway model
  • model testing
  • sites service
  • error ofthe


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