Finland, Hungary and Italy also issued notifications suspending systematic checks at some external border crossing points. In July 2017, Greece submitted a request to suspend the systematic checking of travel documents of those with the right of free movement against relevant databases for a further period of 18 months, due to 'infrastructure shortcomings and increased traffic at 12 airports across the country'. When carrying out checks at external borders, border guards are, by law, required to respect the dignity of travellers (particularly in cases involving vulnerable persons) and are forbidden from discriminating against persons based on their sex, racial or ethnic origin, religion or belief, disability, age or sexual orientation. External border controls are located at roads crossing a border, at airports, at seaports and on board trains. Usually, there is no fence along the land border, but there are exceptions like the Ceuta border fence, and some places at the eastern border. However, surveillance camera systems, some equipped with infrared technology, are located at some more critical spots, for example at the border between Slovakia and Ukraine, where at some points there is a camera every . All travellers entering and leaving the Schengen Area by general aviation or on a pleasure boat have to make their first point of entry/final point of departure in an airport/aerodrome or a seaport that is designated as an external border crossing point. By way of derogation, travellers on board a pleasure boat are permitted to make their first port of call at a port that is not designated as an external border crossing point if they notify the port authorities and obtain authorisation from the border guards. In practice, however, this is a loophole hard to check, and large-scale drug smuggling using private boats has been uncovered. Along the southern coast of the Schengen countries in the Mediterranean, coast guards make a substantial effort to prevent private boats from entering without permission. At many external border crossing points, there are special lanes for EU, EEA and Swiss citizens (as well as their family members) and other lanes for all travellers regardless of nationality. At some external border crossing points, there is a third type of lane for travellers who are Annex II nationals (i.e. non-EU/EEA/Swiss citizens who are exempt from the visa requirement). Although Andorran and San Marinese citizens are not EU or EEA citizens, they are nonetheless able to use the special lanes designated for EU, EEA and Swiss citizens. British citizens will not be able to use the EU lane after Brexit as the rules stand, unless such a right is negotiated into the Brexit agreement with the EU.