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How to cross a toll bridge without money
Pull over in a safe manner.
If there's a generous shoulder on the side of the road, and you can reach this zone without impeding other drivers, pull over before entering the toll booth in order to search for change.
If there's nowhere to pull over safely, skip this step.
You can look for change once you're stopped at the toll booth, or you can just move on with the procedure. Search for loose change in your car or wallet.