A specialized equilibrium assignment algorithm for air quality modeling

Are intrazonal trips ignorable?

“…8 We used "half" of minimum or mean of the respective LOS attributes because the intrazonal trips are on average shorter than the interzonal trips. The imputation methods discussed in section 2.3 also suggest to use "half" of the driving times to the nearest zone (Venigalla et al, 1999) or to the adjoining zones' centroids (BPR method) for intrazonal driving time. 9 We used mean instead of minimum to impute access/egress time and waiting time by PT because it is not realistic to assume that access/egress time and waiting time are less for intrazonal trips.…”

“…According to Greenwald, framing the issue as zone-capture, rather than neighborhood capture, helps relate the discussion to the travel demand modeling process. Venigalla et al (1999) contend that intrazonal trips cannot be ignored for air quality analysis because many of them could end in a temporary mode of operation thereby causing higher emissions due to the fact that they are shorter in length and duration than the trips between zones. They recognize that lack of networks is the main problem for assigning these trips.…”

“…TransCAD uses more or less the same technique to compute the intrazonal travel times. Venigalla et al (1999) applied nearly the same approach to compute the intrazonal travel time and trip length for air quality modeling in their study. They recognized that the main problem for assigning these trips was a lack of network inside a zone.…”

Phone call elasticity of city travel in Ahmedabad

“…The intrazonal distances are calculated by taking one half of the distance to the centroid of its nearest ward (Venigalla et al, 1999). The ward centroids are determined using the land use geometry of the ward looking at facilities that induce (produce or attract) travel (e.g.…”

A Multiclass, Multimode Traffic Assignment Model Considering Emission under Various Engine Operating Modes

“…He also found that GP is more efficient than F-W, and much better for solving nonadditive path costs traffic assignment problems. Venigalla [6] discussed different engine operating modes in traffic assignment program for emission studies, known as TAPES.…”