Only two diverging diamond interchange (DDI) existed in France prior to 2009. DDI is a new type of diamond interchange for many professionals and it provokes their strong interests in studying on it. One major type of current studies on DDIs primarily study signal control strategies on the basis of field implementation and evaluation, and another major type involves comparison with CDIs, Single-point urban interchanges (SPUIs), or other interchanges through microscopic simulation. Up to now, researches on its modeling, analysis, and signal control strategies are still in preliminary stages. Most studies found in the literature only provided some basic phasing schemes which are not the most efficient. Limited literatures studied the effects of cycle length on the performance of traffic signal operation on DDIs. This study comprehensively studies the relationship between the cycle length and operation efficiency of an advanced traffic signal operation on a DDI under five traffic demand scenarios. The simulation results by VISSIM indicate that this study provides several evocative recommendations for selecting the good cycle length of DDIs to traffic professors and engineers.
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