Transit advocates are pushing a regional sales tax as the only option for TransLink to generate the $6.5 billion it needs to expand bus and transit service in Metro Vancouver. In their Leap Ahead plan, released Monday, transportation bloggers Paul Hillsdon and Nathan Pachal suggest a 0.5 per cent regional sales tax, based on the ratio of former HST revenue proportionate to the Metro Vancouver population, would generate nearly $250 million per year.