01628771

Component

https://doi.org/10.3141/2620-02

Even though diverging diamond interchanges (DDIs) have been the subject of research for more than a decade, the effort to standardize interchange signal timing has developed only recently. A three-factor fully crossed experiment was conducted to investigate the influence of crossover spacing and increased volumes on the performance of DDI phasing schemes. PTV Vistro software and the dynamic bandwidth assessment tool were used to optimize the split, cycle length, and offset of each of the 72 treatments. PTV Vissim software was used to collect microsimulation data. Mean interchange delay and mean stops per vehicle were selected as measures of effectiveness. Pairwise comparisons were used to determine whether an existing preferred phasing scheme could minimize delays or stops under three cases: (a) given spacing and increased volume, (b) given volume independent of spacing, and (c) given spacing independent of increased volume. The data revealed that a two- or three-critical-movement phasing scheme usually resulted in the lowest mean interchange delay and the fewest stops. Overall, the results provide an initial signal timing scheme for practitioners given a crossover spacing, an increased volume, or both. Future work will include exploring low volumes, balanced interchange volumes, and their effects on the four-critical-movement phasing scheme, as well as the effect of closely spaced adjacent intersections.

01649617

17-04769

English

pp 10–19

2017

Transportation Research Record: Journal of the Transportation Research Board

9780309441759

Digital/other

Figures (7) ; References (21) ; Tables (3)

Diamond interchanges; Evaluation and assessment; Microsimulation; Spacing; Traffic delays; Traffic signal phases; Traffic signal timing; Traffic volume

Highways; Operations and Traffic Management

PRP, TRIS, TRB, ATRI

Dec 8 2016 11:50AM

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