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Background and Literature Review
Example of a Triangular Distribution to Estimate ADT
Sensitivity Analysis and Tomado Diagrams
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ADT values analyst suggested assumed values Base Tol beneﬁt conﬁdence intervals cost Data Input decision maker Decision Tools suite deﬁne difﬁcult estimates of trafﬁc expected value factors Figure ﬁnancing ﬁve growth rate Harris County higher toll rates impact inﬂuence initial toll rates input parameters Input These inputs input variables macro maximum value mean value MMLM net present value number of tolled order correlation value outcomes Palisade Corporation parameter in question per-mile rate point estimates potential probability distribution project revenues project’s overall random variables range of tolls rate in corridor revenue estimates RISK RMAs route of 12 self-explanatory sensitivity analysis signiﬁcant signiﬁcantly speciﬁc spreadsheet model standard deviation Texas Transportation Institute three estimates Toll Diversion Rate toll projects toll road toll viability screening toll-supported tolled vehicles tomado diagram Tornado trafﬁc growth Travel time savings triangular distribution trip TVST two-axle vehicle TxDOT user’s guide vehicle classiﬁcation viability screening tool