I assume it has a nice way of recognising the border in Ireland and can leash Rees-Mogg missiles of doom (ship's biscuits) on naughty foreigners crossing over.
What happens is every vehicle crossing the border drives over a weigh scale, so the vehicle weight is recorded with the licence plate. The integrated surveillance network of satellites / UAVs / cellphone trackers / traffic cameras monitor every vehicle journey. The start and end is recorded for every journey that crosses the border. The information is stored in a big database which identifies mass transfer over time, highlighting sites with a high net mass loss / gain. These are then cross referenced with declared goods importers / exporters to identify persons potentially trafficking goods illegally.
PS. No good for weapons / drugs but the data could be useful to identify suspicious journeys.