Assessment of Auxiliary Through Lanes at Signalized Intersections (2011) / Chapter Skim
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Pages 14-26
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15 CHAPTER 3: LITERATURE REVIEW This chapter summarizes the results from a literature review that was conducted to identify issues related to the operations, safety, and design of ATLs. Specifically, the literature review: • Provides a summary of capacity and operational effects of ATLs; • Focuses on the safety effects of ATLs paying particular attention to the safety analysis methodology proposed in this study using the Federal Highway Administration's (FHWAs)
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16 the HCM it still suffers from certain drawbacks, most notably the lack of sensitivity to the auxiliary lane configuration, the actual signal timing at the intersection, and, more importantly, the prevailing congestion level and amount of "captive" users in the auxiliary lane. Captive users include right-turning drivers at the signalized intersection from a shared right/through auxiliary lane, and through vehicles that are planning to turn right just downstream of the intersection at nearby driveways.
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17 vehicle overflow in the contiguous lane. His work included the use of the VISSIM microsimulation model (9)
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18 when right-turning traffic beyond the intersection increased. This is an area that deserves further exploration and improved definition.
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19 Lee et al.
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20 (considering only one variable at a time, for instance) , and the lane drop configurations are different from the auxiliary lanes of interest in this work (Type A in particular)
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21 Figure 6. SSAM modeling of lane change conflict (20)
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22 Da W = length from end of taper to stop bar A D = Total through width at intersection, including shared lanes b Figure 7. Auxiliary Through Lane schematic by Leisch ( = Length measured from the stop bar to the beginning of downstream taper (ft)
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23 With respect to taper lengths, the Green Book submits that short tapers are ideal for urban deceleration lanes because of the slow operating speeds at peak conditions. For straight-line tapers, the book recommends an 8:1 longitudinal to transverse (L:T)
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24 Figure 8. Length of right- or left-turn lane recommended by Leisch (24)
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25 The work by Buckley et al.
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26 Feldblum's research for the Connecticut DOT (20) investigated the use of customized signage downstream of an ATL.
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27 to induce more even lane utilization, although the sample sizes in those studies were obviously limited.
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