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Consistency is the relationship between the geometric characteristics of a highway and the conditions a driver expects to encounter. In this study, based on operating speed, consistency was calculated in two-lane rural highways of the province of Granada, Spain. Three consistency measures were calculated for 506 homogeneous road sections: the relative area, which represents the area bounded by the speed profile and average speed of a road segment; the standard deviation of the operating speed in each design element along the road segment; and a consistency model based on the previous measures introduced. Some discrepancies regarding the obtained results lead the authors to propose a new model of consistency that overcomes the identified disagreements.
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Garach et al. (2014) studied this question.
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