# Modeling operating speed : synthesis report by National Research Council (U.S.). Transportation Research

By National Research Council (U.S.). Transportation Research Board. Operational Effects of Geometrics Committee

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Each individual maximum speed increase in the distribution is taken as the difference between the maximum speed on the DT and the minimum speed on the curve for an individual driver; LAT = length of approach tangent (m); CCR = curvature change rate; LDT = length of departure tangent (m); R = radius of curve (m); and DFC = curve deflection angle (degrees). 28 Transportation Research Circular E-C151: Modeling Operating Speed The authors concluded that driver speed selection on two-lane rural highways is highly correlated to the geometric features.

Regression models were estimated to determine how selected variables affect operating speed on horizontal curves and straight sections. When all variables were considered, posted speed limit was the most significant variable for both curves and tangent sections. Other significant variables for curve sections were deflection angle and access density class. In another series of analyses performed without using posted speed limit, only lane width was a statistically significant predictor variable for tangent sections, while median presence and 40 Transportation Research Circular E-C151: Modeling Operating Speed roadside development were statistically significant predictor variables for curve sections.

2000) argued that the design speed process can lead to inconsistent geometric designs. This is because there is no feedback loop in the design process to estimate operating speeds during the design process. Figure 1 illustrates the conceptual relationship of speed characteristics that was developed. This figure shows that the critical point design speed, or inferred design speed, can exceed the AASHTO design speed on low-speed urban streets, operating speeds exceed the AASHTO design speed, the critical point design speed varies along the alignment, operating speeds vary excessively along the roadway alignment, speed variance may be large in places, and the posted speed limit can exceed the AASHTO design speed.

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