In the short term motorists will have to struggle through three more projects on the Circunvalación. The first starts in September, said the Ministerio de Obras Públicas y Transportes.
But when the jobs are done, the traffic circles will be converted into slip ramps and overpasses.
The ministry said that the first job will be at the Rotunda traffic circle of Las Garantías Sociales in Zapote. Two months later, work will begin at the Rotunda de Las Banderas in San Pedro and the intersection in Guadalupe.
Work already is going on at the traffic circle in Paso Ancho, known locally as the Rotunda de Guacamaya.
The new projects carry a $50 million price tag backed by the Banco Centroamericano de Integración Económica.
There have been some delays due to evictions, but the ministry also is in the process of constructing the northern loop of the Circunvalación from the current terminus in La Uruca to Ruta 32 north of San José.
This job, when completed, will keep heavy trucks off San José streets.