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ADVISORY SPEED CRITERIA 216
ENGINEERING STUDY METHODS FOR SETTING A CURVE ADVISORY SPEED 231
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81 curves advisory speed criteria Advisory Speed plaque average curve speed average speed ball-bank indicator method ball-bank reading Bonneson calibration coefﬁcients chapter Chevrons Chowdhury compass method consistent curve advisory speed curve length curve radius curve severity curve speed choice curve warning signs daytime deﬁned Delineators evaluation Federal Highway Administration ﬁeld ﬁgure ﬁiction ﬁndings friction differential geometric guidance guidelines highway curves identiﬁed inﬂuenced Lyles and Taylor mean square error measured MUT CD nighttime speeds passenger car speed path radius pavement percent percentile curve speed percentile speed percentile tangent speed posted advisory speed procedure raised pavement markers regression regulatory speed limit relationship root mean square rural highway shown in Figure side friction demand signiﬁcant similar geometry speciﬁc speed differential speed prediction model speed reduction Speed sign standard deviation subsection superelevation rate Table Texas Texas Transportation Institute trafﬁc control devices trend line truck speed TxDOT variability