RES 89175 - Laserfiche WebLink

SR 89:133 Page 2 Estimates of "Generated Traffic" have been made using the best available projection tools, i.e., Institute of Transportation Engineers "Trip Generation" data, Caltrans "Trip Generation" data, and local experience. It is generally agreed that where possible, these data should be calibrated to reflect local travel behavior, and the Council in 1987 directed staff to develop a Pleasanton- based trip generation rate. In April 1988 these trip generation assumptions were revised by City Council to take into account information generated by local Pleasanton data produced from the 1987 Employee TSM Surveys. These Employer Survey data were factored to account for vehicle occupancy (from the Employer Survey), and adjusted for building occupancy (from City records). An 80% arrival 20% departure rate was assumed, and an AM and PM peak hour rate of 2 trips/i,000 sq. ft. of office was derived and subsequently adopted. Driveway Study In the fall of 1988, staff decided to check a sample of the "Office" buildings represented by the 1988 TSM Survey against manual traffic counts of the driveways. This was done to get a current sample of what actual trip rates are today. The 1988 driveway counts were done at 16 office sites (Appendix 1.) comprising 2,864,807 sq. ft. of gross floor space and 7,662 total employees. These 7,662 employees represent 84% of Haciendats employees and 80% of the total 9,568 North Pleasanton "Office" employees used in the Trip Generation Spread Sheet. Sites were selected based upon the ability to isolate the trips generated by the study building from any adjacent building. Buildings with nearly full occupancy were selected. Figure 2 shows sites and square footages. "People" in addition to "vehicles" were counted to provide information on "Average Vehicle Occupancy" during the peak hour. Both "Arrivals" as well as "Departures" were also counted so that a "Directional Distribution" percentage of "Enter" vs. "Exit" could be developed. Figure 3 shows this directional distribution and vehicle count for the PM peak. Departing trips were 85% of Total trips and Arrivals were 15%. (80% - 20% was assumed in 1987 and all previous years). The following factors are needed to refine TSM data: a) The percentage of the surveyed employees are of the total number of employees. b) The percentage of employees that actually leave work on any given day as compared to total employees projected to leave (accounts for those sick, on vacation, and employees who are at some location remote from their base office when they quit work on a specific day, etc.).