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 Interactive Highway Safety Design Model design consistency module.
Speed-Profile Model for Two-Lane Rural Highways
Transportation Research Record
Transportation Research Record: Journal of the Transportation Research Board ; 1737 , 1 ; 42-49
2000-01-01
Article (Journal)
Electronic Resource
English
Speed-Profile Model for Two-Lane Rural Highways
Online Contents | 2000
|Speed Prediction for Two-Lane Rural Highways
NTIS | 2000
|Speed Variability on Rural Two-Lane Highways
Online Contents | 1999
|Speed Variability on Rural Two-Lane Highways
Transportation Research Record | 1999
|Operating Speed Model for Low-Speed Rural Two-Lane Highways
Transportation Research Record | 2011
|