In certain cases, countries adopt border control policies imposing reduced border controls for frequent travellers intending to remain within a border area. For example, the relaxed border controls maintained by Bhutan for those not proceeding past Phuentsholing and certain other border cities enable travellers to enter without going through any document check whatsoever. The American Border Crossing Card issued to Mexican nationals enables Mexicans to enter border areas without a passport.[lower-alpha 13] Both America and Bhutan maintain interior checkposts to enforce compliance.