Assessment of Auxiliary Through Lanes at Signalized Intersections (2011) / Chapter Skim
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51 CHAPTER 6: OPERATIONAL ANALYSIS AND MODELING The research team conducted a detailed analysis of the field data to determine the factors that influence ATL use and to identify appropriate method for predicting lane use in the ATL. As described in the Operations Concept Method section, a simulation-based approach and analytical-based approach were developed on the premise that drivers will choose to use the ATL based on a perceived travel time savings gained by using the ATL.
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52 Table 17. Field descriptive statistics.
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53 Figure 23. ATL through-movement flow vs.
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54 Figure 25. ATL flow vs.
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55 The plots in figures 23-26 indicate that the relationship between ATL flow rate and either through-movement flow rate or XT STATISTICAL MODEL DEVELOPMENT may be non-linear. While the 1-CTL data appears to be fairly consistent when compared across several sites, there is considerably more variation in the 2-CTL data by approach.
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56 should otherwise encourage high ATL use (e.g. high through-movement volume, exclusive right turn lane, no driveways)
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57 Figure 27. Model validation plots.
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58 ESTIMATING ATL LENGTHS A key design element of ATLs is the appropriate length of the ATL's upstream and downstream components. Although it may be hypothesized that a longer ATL promotes higher ATL use, extensive field observations of ATLs tend to contradict this theory.
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59 The figure shows the minimum, average, and maximum ATL utilization per site for 1- and 2CTL approaches. It is clear from the data that downstream length plays little, if any, role in enticing drivers to use the ATL at the observed sites.
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60 The Input Dialog Box The input dialog box for the 2-CTL case is depicted in Figure 29 below. Users enter all the required input data in the yellow-colored boxes.
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61 or 2-CTL" tabs. Otherwise, all model findings and design lengths are given in the SUMMARY spreadsheet, as shown in Figure 30.
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62 Table 20. Required ATL storage length.
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63 1. Run the HCM 2010 computational engine without the ATL(s)
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