The highway agency said Tuesday that it may close Ruta 32 during periods of heavy rain even if there are no slides.
The agency, the Consejo Nacional de Vialidad, said that the action would be taken to save lives and prevent accidents.
Work crews have just finished cleaning up a gigantic slide some 35 kilometers north of San José on the key highway. The cliffs along the west side of the highway are unstable, and road officials admit that the entire stretch through Parque Nacional Braulio Carrillo needs to be rebuilt. But the job would be massive.