Related by context. Frequent words. (Click for all words.) 44 airports 44 seaports 40 bridges tunnels 40 border crossings 39 railway stations 39 highways 36 terminals 36 shopping malls 35 baggage screening 35 thermal scanners 35 railways 34 X ray machines 34 x ray machines 34 ports 34 subways 33 electrical grids 32 interstate highways 32 checkpoints 32 Schiphol Airport 32 homeland security 32 surveillance 32 container terminals 32 International Airport KLIA 32 checkposts 31 radiation detectors 31 railroads 31 Ben Gurion Airport 31 ferry terminals 31 interstates 31 containerized cargo 31 infrastructure 30 motorways 30 manned checkpoints 30 biometric ID 30 cargo containers 30 railway crossings 30 Checkpoints 30 blockades 30 roadways 29 mass transit 29 pipelines 29 expressways 29 convoys 29 LNG tankers 29 Suvarnabhumi Airport 29 bomb sniffing dogs 29 perimeter fencing 29 Suvarnabhumi airport 29 Hobby Airport 29 electricity grids 29 Airports 29 transborder 29 courthouses 29 freeways 28 border 28 inland waterways 28 Rapiscan Systems 28 chokepoints 28 LaGuardia airports 28 Changi Airport 28 malls 28 laboratories 28 refined petroleum products 28 CBP 28 cargo 28 concessioning 28 refineries 28 patdowns 28 scanning 28 transit 27 Erez Crossing 27 terminal 27 seaport 27 Interstates 27 airbases 27 freight railroads 27 depots 27 Gwadar Port 27 Registered Traveler 27 customs clearance 27 hotels 27 Border Crossing 27 Otay Mesa 27 Eisenhower Tunnel 27 border crossing 27 scanners 27 Karni crossing 27 Erez crossing 27 mass deportations 27 inland waterway 27 Gatwick airport 27 Jawaharlal Nehru Port 27 TSOs 27 borders 27 wildlife refuges 27 airport 27 biometrics 27 Amsterdam Schiphol airport 27 petrol stations 26 heavily fortified border 26 Port Qasim