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What kind of decking will you use?
What is the width of the bridge?
2" wood planking can't span between beams to support that kind of load.
for that kind of load, you should use a concrete deck with three beams. I can size the beams as this question and I can design the deck for you as an additional service, if you're interested.
No problem. I'm happy to help. Good luck with your project.