This is a multiyear ongoing project with NYSDOT that is led by Wiley Engineering, P.C.; the first few assignments have been completed. These included retiming a section of NY 106/107 in Nassau County from Manhattan Drive to the NY 106 and NY 107 fork. The periods of interest were both the AM and PM Peaks. Multiple field visits were completed to reaffirm the patterns and observe traffic operations. Trip logs were recorded using a GPS enabled device. Sample split logs provided for the signal controllers were analyzed. Synchro/SimTraffic was used to test signal timing refinements and to estimate potential improvements.
Another assignment was the evaluation of existing conditions at the Long Island Service road intersections and Lakeville Road in Nassau County during the PM Peak. Multiple field visits were completed to reaffirm the patterns and observe traffic operations. Signal timing data, historical turning movement count data, and the existing Synchro model of the area were reviewed. The complexity of this study area results from three competing approaches with heavy volumes vying for green time, with a downstream link that lies between the LIE Service Roads (<250 feet of storage). Long queues form as a result during peak PM conditions. An extended model of the area was developed, based on existing data, using VISSIM. This model was used to identify potential solutions to mitigate congestion.