Is a bus ticket sufficient proof of onward travel when entering Thailand on a visa-exempt entry?

The original question inquires whether a bus ticket out of Thailand would be considered acceptable proof of onward travel upon entering the country as a visa-exempt traveler. Responses highlight that airlines may have their own policies regarding this, and that bus tickets may not be viewed as valid evidence of exit since they often do not represent international travel. Some users suggest checking with the embassy for quicker tourist visa options, while others share personal experiences indicating that they have entered Thailand without being asked for proof of onward travel.