The wider the lane the easier it will be to pass traffic with a bicycle generally, but that doesn't necessarily mean it is not possible to pass if the lanes are narrow.
There are many narrow laned roads where I don't pass, however physically I could but that would mean the drivers I passed would need to repass me moments later. Since they were courteous, took their time and passed safely the first time using the adjacent lane, I wouldn't want to make them do it again for no gain on my part.
Al