CEE111_W12_Design_Exercise_4

CEE111_W12_Design_Exercise_4 - CEE111DesignExerc ise4...

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As the pr (MPO), y corridor City of Irv eastboun traffic as The secti transition ramp me the so ca density ( have bee densities freeway density r value, flo maximum about 8,0 rincipal trans you have bee comprised o vine), as sho nd lanes of t sociated wit ion of freew n of traffic o etering) cont alled fundam vehicles/mil en gathered s less than ab is stable wit elationship ow becomes m flow rate t 000 vehicles sportation e en assigned of a freeway own in the d he freeway th these eas ay under co onto this free trolled by th mental diagra e), and flow from loop d bout 110 veh h average sp in the stable unstable, le that can be a s/hour, and o CEE 111 D W Due Feb Work in engineer for the task of d (managed b iagram belo have been s tbound lane nsideration eway is subje e local Caltr am of traffic (vehicles/h etector stat hicles/mile ( peeds of abo e region indi eading to “st accommoda occurs at a d Design Exerc inter 2012 bruary 29, 2 ndependent a certain Me determining by Caltrans) w; here, for shown, and t es. joins anothe ect to freew ans District. —a relation our). For th ioned along (or, about 27 out 75 miles cated in the top and go t ated) of the f density of fre cise 4 2012 ly!!! etropolitan options for and arterial purposes of this design p er freeway a ay to freew Flow on th nship among his particular g the freeway 7.5 vehicles/ s/hour (whic e figure); for traffic condit freeway is se eeway traffic Planning Org managing a streets (ma f analysis, on problem rela at the easter ay metering e freeway is g speed (mile r freeway, th y. The data /mile/lane), ch is the slop densities gr tions. The c een from th c of about 1 ganization 20 mile tra anaged by th nly the ates only to rn boundary g (similar to s governed b es/hour), tra he following indicate tha flow on the pe of the flow reater than t apacity (i.e. e figure to b 10 vehicles/ ffic he y; by affic data at for w this , be /mile.
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The city streets offer alternative routes to eastbound freeway traffic to access destination points downstream of the freeway lane drop (freeway goes from 4 lanes to 3 lanes, and is subjected to freeway to freeway metering) shown in the extreme right of the figure above; there are a number of exit ramps along the freeway by which freeway traffic can divert onto city streets to continue their journey eastward. The amount of traffic choosing to divert onto city streets depends, in large measure, on the performance of the city traffic network, which is primarily controlled by the traffic signal settings; for example, certain key arterials can be timed to provide “signal progression” that can come close to providing near freeway performance.
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This note was uploaded on 03/30/2012 for the course CIVIL ENGI CEE111 taught by Professor Recker during the Winter '12 term at UC Irvine.

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CEE111_W12_Design_Exercise_4 - CEE111DesignExerc ise4...

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