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ve Chris Seigle October 27, 1988 Page 4 These two intersections currently have adequate traffic capacity and the pro- ject's impact on each will be minimal. The unsignalized intersections of Lexington Avenue with Grandview Avenue and the project access driveway were analyzed under the assumption that traffic signals would be undesirable at either of these intersections. Each is too close to an existing adjacent signal to operate effectively if signals were installed. Therefore, the analysis of traffic operations was concentrated on the maximum allowable traffic that would be desirable under an unsignalized condition. In such cases, the left turn onto the major street is the critical movement at an unsignalized intersection. Based on standard warrants for traffic signals, it is considered desirable to have less than 150 peak hour left turns per hour onto a major through street such as Lexington Avenue. The following table summarizes the project's traffic impact in consideration of this analysis: Intersection Lexington/Grandview Lexington/Project Access Number of Side Street Left Turns (veh/hour) Existing Plus Maximum Existing Project _ Desired 10 (163 1150 45 100 150 Given the analysis presented above, no major improvements are needed at these two intersections. However, it is recommended that two full lanes (i.e., a right turn lane and a left turn lane) be provided at the project's exit to Lexington Avenue. This would require some additional roadway width beyond that shown on the project site plan. It should be noted that existing traffic which uses the roadway which will become the project driveway to Lexington Avenue con- sists mainly of traffic to and from an existing day-care center. In addition to PM peak hour traffic: conditions described above, outbound project traffic is also expected to peak in the period from 2 PM to 3 PM, corresponding to the end of the school day. During this period, mor- I-raffic would be expec�ed to be generated by the school than during the PM peak hour, but the impact would be less since traffic on Lexington Avenue is lower during this time period. This analysis has been conducted assuming a student population of 300 at the school. It is expected that some expansion is possible beyond 300 students. Given the analysis described above, an expansion in the of the range of 50 to 100 stu- dents would not significantly change theresults