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Speed-profile model for two-lane rural highways Fitzpatrick, Kay ; Collins, Jon M

By: Fitzpatrick, KayContributor(s): Collins, Jon MPublication details: Transportation Research Record, 2000Description: nr 1737, s. 42-9Subject(s): USA | Layout | Consistency | Driver | Prediction | Speed | Alignment | Mathematical model | Acceleration | Deceleration | | 31Bibl.nr: VTI P8167:1737Location: Abstract: Design consistency refers to highway geometry's conformance with driver expectancy. Generally, drivers make fewer errors at geometric features that conform with their expectations. A proposed method for evaluating design consistency is to predict the speed along an alignment by using a speed-profile model. A speed-profile model was developed by using the following: speed prediction equations that calculate the expected speed at horizontal, vertical, or combination curves; assumed desired speed for the roadway; TWOPAS equations that determine the performance-limited speeds at every point; acceleration and deceleration rates; and several documented assumptions. The speed-profile model can be used to evaluate the design consistency of a facility or to generate a speed profile along an alignment. In conclusion, the speed-profile model developed appears to provide a suitable basis for the IHSDM (Interactive Highway Safety Design Model) design consistency module.
Item type: Reports, conferences, monographs
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Design consistency refers to highway geometry's conformance with driver expectancy. Generally, drivers make fewer errors at geometric features that conform with their expectations. A proposed method for evaluating design consistency is to predict the speed along an alignment by using a speed-profile model. A speed-profile model was developed by using the following: speed prediction equations that calculate the expected speed at horizontal, vertical, or combination curves; assumed desired speed for the roadway; TWOPAS equations that determine the performance-limited speeds at every point; acceleration and deceleration rates; and several documented assumptions. The speed-profile model can be used to evaluate the design consistency of a facility or to generate a speed profile along an alignment. In conclusion, the speed-profile model developed appears to provide a suitable basis for the IHSDM (Interactive Highway Safety Design Model) design consistency module.

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