1. A passage or tunnel built beneath the surface of the ground, typically used for pedestrians or vehicles to cross beneath a road, railway, or other obstruction
The underground crossing allows pedestrians to safely cross the busy highway without using the surface streets.
A passagem subterrânea permite que os pedestres atravessem a rodovia movimentada com segurança sem usar as ruas de superfície.
2. A subway or metro tunnel system used for transportation
The city built a new underground crossing to reduce traffic congestion.
A cidade construiu uma nova passagem subterrânea para reduzir o congestionamento.