Wednesday’s poll reflected the opinions of 400 Portland-area drivers, but only 52 Clark County residents. That’s because the data was collected as part of a larger set of surveys in April, according to PEMCO Insurance. Though 600 Washington residents were surveyed in total, only the 52 from Clark County were included in the Columbia River Crossing results, according to the insurance company, which commissioned the poll.A majority of Portland and Vancouver drivers say they’ll likely head for the Glenn Jackson Bridge once tolling begins on the Interstate 5 Bridge, according to a poll released Wednesday.A total of 54 percent of respondents — 77 percent of drivers in Clark County and 52 percent of Portland-area motorists — said they’d skip tolls on I-5 by using toll-free Interstate 205 between Vancouver and Portland.Just 33 percent said they would be undeterred when tolling starts on the I-5 Bridge to help pay for its replacement, the Columbia River Crossing. Other respondents indicated they’ll opt for an alternative option such as carpooling, public transit or telecommuting, according to the poll commissioned by PEMCO Insurance.This week’s poll, conducted by Seattle-based FBK Research, surveyed 400 people in the Portland metro area and 52 in Clark County, according to PEMCO. That gives it a 5 percent margin of error for the Portland results, and a nearly 14 percent margin of error for Clark County’s numbers, the insurance company said.