Translation with deepl:
This is no joke! Two German tourists got a criminal record because they thought Romania had joined the Schengen Area! It all started after the surveillance cameras located near the border line, on the Garbolcz road (Hungary), at the S.P.F. Petea headquarters, around 17.40, issued an alert and transmitted images of two people riding their bicycles from Romania to Hungary, according to PresaSM information.
The images transmitted by the surveillance cameras showed the two people riding around the concrete obstacle and the barrier on the road, illegally crossing the border from Romania into Hungary. The intervention team of S.P.F. Petea was alerted and went to the scene, but the two persons could not be identified and detained.
At the same time, the Hungarian border authorities were informed and sent a team to the area, thus managing to apprehend the two persons. During the border meeting that took place at the S.P.F. Petea headquarters, in order to jointly investigate the border event, the Hungarian border authorities informed that the two persons are German citizens.
According to PresaSM data, in front of the Hungarian authorities, the persons in question declared that they were on holiday and were travelling on bicycles guided by the GPS application of their mobile phones. This is how they arrived in the town of Petea, where the app showed them that there was a border crossing point, as they intended to cross the border from Romania into Hungary. Being used to travelling freely through Europe, without customs controls between countries, they did not know that they could not cross the border there.
Checks are optional within Schengen, no one has to but can e.g. when Austria wants to check for illegal immigrants and sets up checkpoints at the border. Border crossings are often just rural roads where the road surface suddenly looks different and there are slightly different looking signs. On some there are still old customs buildings, especially crossings within cities but also no staff.
Even crossing out of the EU into Switzerland (Schengen), I have never been asked for documents. I have seen customs buildings but it’s an open crossing and no one even standing there to check for anything when leaving the EU.
Yes but Romania is not in Schengen