The only airport in the world to have a public road run across the runway is Gibraltar Airport. On the world map a small state called Gibraltar, is a self-governing British overseas territory located on the southern end of the Iberian Peninsula and Europe at the entrance of the Mediterranean overlooking the Strait of Gibraltar. The territory covers 6.843 square kilometers and shares a land border with Spain to the north. The Gibraltar Airport is 1,600 feet from the city, the shortest commute of any major airport in the world. British Gibraltar has very little area, and the important airport runway takes up a major portion of land. To drive from Gibraltar to Spain, vehicles must cross the runway.

The road in question, La Linea, is the one that goes from Spain to Gibraltar. In order to pass through, you have to cross the runway. There wasn't enough land to build a proper airport in Gibraltar from La Linea in Spain, so this one was built with the runways going across main traffic roads. Cars have to actually drive across the runway, and sometimes when the planes are setting off it seems like a very close encounter indeed

Well, to ensure everything runs smoothly, airport officials give warning to pedestrians and vehicles (in the same way as a level crossing would), but on a far greater scale. Operations shut down for 15 minutes and armed police gather around the British Naval base. Drivers and pedestrians wait until the plane goes past, then taxis the other way. Once the barriers open, you’re free to drive. The border between Gibraltar and Spain is always open for vehicles and pedestrians.