The Oregon Department of Transportation is conducting an on-line survey on transit in the Gorge.  ODOT spokesman Don Hamilton says the Gorge Transit Study is part of a response to increased automobile traffic through the region.  Hamilton uses Multnomah Falls as an example of a growing congestion problem, with ODOT installing a gate to shut off access to the site from Interstate 84 when the parking lot there is full.  Hamilton says ODOT is considering the establishment of a shuttle bus so people can visit the Gorge without bringing their cars.  The survey is on-line through Sunday at gorgetransitstudy.org.