 Speed and Delay on Signalized ArterialsNo 199803, Working Papers from University of Minnesota: Nexus Research Group Abstract: This research presents a model to predict the influence of demand and capacity on the running speed of signalized arterials in Montgomery County, Maryland. The model separates the changes to link running speed due to same-direction traffic and intersection approach delay from cross traffic. It is found that flow has a small impact on link speed, each 1000 vehicles per lane per hour reduces speed by 4 - 8 kph. Longer links have higher speeds, indicating that they more closely approximate free-flow conditions. A surprising result comes from measuring the effect of an additional lane on link speed, after controlling for flow per lane. It is found that there are slight diseconomies of additional lanes in terms of speed, each additional lane is associated with somewhat slower speeds. Measures of intersection and link travel times are also compared. Although link running times exceed intersection stopped delay, total intersection delay (stopped and approach) exceeds the delay caused by same-direction traffic. This information can inform investment decisions about roadway and intersection improvements. Keywords: volume-delay function; signal delay; approach delay; traffic flow theory; running speed; highway capacity; Montgomery County Maryland . (search for similar items in EconPapers) Published in ASCE Journal of Transportation Engineering 124: 3 258-264. Downloads: (external link) Related works: Export reference: BibTeX RIS (EndNote, ProCite, RefMan) HTML/Text Persistent link: https://EconPapers.repec.org/RePEc:nex:wpaper:speed Access Statistics for this paper More papers in Working Papers from University of Minnesota: Nexus Research Group Contact information at EDIRC. |
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