 Based on projected ridership, a blend of both alternatives was proposed, retaining the low-level single-track drawbridge as marine traffic was expected to remain light.Regional Measure 2 (RM2) was approved by a majority of Bay Area voters in March 2004, raising toll rates by US$1 on the region's toll bridges.was allotted to the Dumbarton Rail Corridor project from the increased tolls as one of the headline projects cited by supporters of RM2.