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hi,

The bridge was just wide enough for up to three cars to pass each other or each others?

each other or each others?

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English Learner 2593each other or each others?

each other

But the message is unclear. We talk about one car passing another (to get ahead of it), but not about three. Your sentence suggests three cars circling around each other in some weird configuration.

I think you mean

The bridge was just wide enough to accommodate three lanes of traffic.

CJ