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The route is still blocked, but if you look through the chain link fence on the side where the bridge is raised, you should see a trailer from a truck. Get the sniper rifle and aim at it's tires and you should see a wooden block stopping the trailer rolling back. Shoot it and it should roll down the path towarsds the bridge where it'll knock it down enabling you to cross it.
That is however, if you are where I think you are.