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Major Merge analysis

Heather McColeman
Ohio DOT
Major Merge analysis was posted on September 6th, 2012 at 3:13 PM EDT
regarding Chapter 13: Freeway Merge and Diverge Segments

Page 13-4 of the HCM: "Exhibit 13-2 summarizes the LOS criteria for freeway merge and diverge segments. These criteria apply to all ramp-freeway junctions and may also be applied to major merges and diverges. . ."

Page 13-26 of the HCM: "There are no effective models of performance for a major merge area. Therefore, analysis is limited to checking capacities on the approaching legs and the downstream freeway segment. . . LOS cannot be determined for major merge areas."

Which is it?

Gustavo Riente de Andrade
TECTRAN - T├ęcnicos em Transportes ltda
RE: Major Merge analysis was posted on September 7th, 2012 at 11:14 AM EDT

I interpret this in the following manner: there is no specific method for major merge and diverge areas. However, although not ideal, the ramp method could be used to as an aproximation to those facilities, in the abscence of other alternatives. Other aproach could be using the LOS criteria for ramps, calculating the measures of effectiveness with the aid of alternative tools, such as microscopic traffic simulation.

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