Meeting somebody going the other way can happen very easily at non-towered fields in the US with only a Unicom or CTAF. Absolutely essential to discover which way everybody else is flying before joining the pattern (downwind on the 45 none of these standard overheads) especially when the wind is light and variable. Even more so when the same Unicom frequency is used at another field 30 miles away.
Particularly when it's RH on one runway and LH on the reciprocal..