In speech, there is no difference in my dialect. I would write "passenger's".
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ryansamturnerI've looked into this a bit more. Passenger side seems more commonly used.Where? On the Internet? That doesn't matter. We're talking about standard English written for literate people who will be distracted at best by odd usage.
ryansamturnerIf i were using an apostrophe, would it not then be passengers' side as there may