Could someone tell me what this is exactly called in English? I tried going with a "checkpoint" but I couldn't find further information and I need it for work urgently.
It isn't quite clear from the picture what it is, and that is relevant because it depends on the purpose of the structure. For example, it could be a tollbooth on a motorway, or it could be a security checkpoint at a border. These type of barriers are used in various ways. The word 'checkpoint' implies that some kind of procedure is involved, i.e. showing ID. This would not be the case with a tollbooth where a simple exchange of money happens. In other words, a 'checkpoint' is a place where something is checked, usually some kind of document like ID which verifies the person has permission to cross through the barriers.