Traffic on the Circunvalación southern bypass still was down to one lane in each direction Thursday while workers tried to get two more bailey bridges into service.
The Consejo Nacional de Vialidad said that the fourth bridge finally was in position and that what remained was constructing access ramps.
Traffic now passes over the site of a major washout on two bailey bridges. Weather permitting, officials hope to have four bridges in service by the weekend.
Even in the best of times, traffic is slow going on some parts of the four-lane highway. The washout took place in the westbound lanes between Hatillo 8 and the Pavas turnoff.
That is an area notorious for slow weekday traffic because of signals at the Hatillo cross street and grades on the highway itself.