More rocks and debris fell from a roadside cliff onto Ruta 27, the Caldera highway, Sunday. That prompted a study Monday by a firm that has expertise in geological situations.
The highway at Kilometer 46 at a spot known as Dantas was not closed but one lane was blocked by the rock and dirt.
This is a continual problem with the highway as well as Ruta 32 north of San José. Rains loosen the rocks which then threaten motorists.
The Consejo Nacional de Concesiones estimated the debris at eight cubic meters. That is about 10.5 cubic yards.
The Consejo said that the roadway is monitored continually.
The highway experienced extensive trouble with falling rocks when it first opened. There even was the death of a woman who was hit by rocks while a passenger on a motorcycle.