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The base year values for SOV use were determined from 1980 and 1990 census data, along with <br /> information from the Puget Sound Regional Council's 1990 transportation model. The following <br /> table summarizes the base and goal levels for SOV use and VMT in the Everett/Mukilteo Zone. <br /> YEAR SOV PERCENTAGE VMT/EMPLOYEE <br /> 1992(base) 80% 8.5 <br /> 1995 68% 7.2 <br /> 1997 60% 6.4 <br /> 1999 52% 5.5 <br /> 2005 <br /> Basic Methodology for Calculating SOV Trips <br /> The proportion of SOV trips and VMT per employee values for each affected employer will be <br /> determined using data from a survey of employees about their commute mode choice as shown in <br /> Exhibit 1. <br /> Calculation Assumptions <br /> The following assumptions will be used in counting commute vehicle trips: <br /> • Single-occupant vehicle trips count as one trip (includes one-person motorcycle and drive-on <br /> ferry trips). <br /> • Carpool trips count as the inverse of the number of occupants in the vehicle: <br /> • Two-person carpool counts as one-half trip, 3-person carpool counts as one-third trip, 4-person <br /> carpool counts as one-fourth trip, 5-person carpool counts as one-fifth trip, 6-person carpool <br /> counts as one-sixth trip. <br /> • Vanpools of seven or more occupants and transit(bus and bike-on ferry or walk-on ferry)count <br /> as zero vehicle trips. <br /> • Telecommuting,alternative work schedules(excluding flex-time),bicycling,and walking count <br /> as zero vehicle trips plus a 20 percent credit-each commute trip eliminated or using non- <br /> motorized modes is counted as 1.2 trips eliminated. This assumption applies to both proportion <br /> of SOV trips and VMT per employee. <br /> For calculation purposes,VMT per employee is assumed to be the average trip length multiplied by <br /> the number of vehicle trips per employee (based on the above assumptions). As SOV trips are <br /> eliminated,fewer vehicle miles will be traveled. <br /> 8 <br />