For further security, the bridge was built to withstand gusts of wind up to 140 miles per hour [220 kph] and seismic shocks four and a half times greater than the earthquake that destroyed much of Lisbon in 1755.
Täiendavad turvameetmed aitavad sillal taluda tuuleiile, mille kiirus on kuni 220 kilomeetrit tunnis, ja seismilisi tõukeid, mis on neli ja pool korda tugevamad kui 1755. aastal Lissaboni laastanud maavärin.