This is the last July Fourth weekend that Washingtonians will pay $2.50 to cross the Chesapeake Bay Bridge as they head for a getaway at the popular Atlantic Ocean beaches. The toll will double to $5 in October and jump to $8 by 2013, shocking Marylanders.

But transportation analysts say drivers should get used to paying a high fee to cross a bridge or drive on a road — tolls will increasingly replace gasoline taxes as the way states will pay for their transportation infrastructure in the future.