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There is also the question if your hero needs to be that specific. Wouldn't it be enough if he describe the trail as '(barely) wide enough for one wagon'?
Depending on the surrounding vegetation and terrain, the local width of the trail could fluctuate greatly.
The people your hero is talking to should understand how wide a trail for one wagon is. Your readers will also have a notion of it. It may not be the same as your notion, but you have to decide if an exact measurement is needed. If it is not needed, than I would prefer comparative descriptions over numeric ones, because my notion of 'one lane' is much better than '3m' and I do live in a society using metric measurements.
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