ABSTRACT
The first phase of the construction of the Tagus river suspension bridge in Lisbon was completed in 1966. At that time the bridge had only 4 lanes of roadway traffic, although a second phase of construction was already planned in which a railway deck would be added to the bridge. The second phase of the construction could only be putted into practice in the end of the nineties with the planned addition of two railroad tracks at the lower level of the stiffening truss and the widening of the roadway deck to 6 lanes which wasn’t considered in the initial plans.
