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Ariana Cubillos, Associated Press
A man peers from behind his makeshift shield carrying the Spanish messages "For my grandchildren" and "Free Venezuela" on a highway during a national sit-in against President Nicolas Maduro, in Caracas, Venezuela, Monday, May 15, 2017. Opposition leaders are demanding immediate presidential elections.

CARACAS, Venezuela — Thousands of protesters hauled folding chairs, beach umbrellas and coolers onto main roads across Venezuela Monday for a national sit-in.

The "sit-in against the dictatorship" is the latest in a month and a half of street demonstrations against President Nicolas Maduro that have left dozens dead. Many Caracas businesses were closed and taxi drivers suspended work in anticipation of a city-wide traffic shutdown.

Opposition leaders are demanding immediate presidential elections. Polls show the great majority of Venezuelans want Maduro gone as violent crime soars and the country falls into economic ruin.

The European Union is also calling for Venezuela elections. EU foreign ministers said Monday that "violence and the use of force will not resolve the crisis in the country."

And the U.S. has expressed grave concern about the erosion of democratic norms in the South American country.

The protests were triggered by a government move to nullify the opposition-controlled Supreme Court, but have morphed into a general airing of grievances against the unpopular socialist administration.

As demonstrations take over Caracas almost daily, normal life has continued, but suffused with tension and uncertainty. At fancy cafes, patrons show each other the latest videos of student protesters getting hurt or statues of the late President Hugo Chavez on their phones. Working class people who have to traverse the capital city for their jobs have adjusted their schedules to account for the daily traffic shutdowns, and are taking siestas to wait out the clashes between protesters and police.

On Monday, protesters stayed in main roads for six hours, then began to disperse under a heavy rain. The pledged to take to the streets again the next day.

More than three dozen people have been killed and hundreds injured in protests that erupted after the Supreme Court issued a ruling March 29 nullifying the opposition-controlled National Assembly, a decision it later reversed amid a storm of international criticism and outrage among Venezuelans. Hundreds of thousands of people have taken to the streets to castigate Maduro's administration, which they claim has become a dictatorship responsible for triple-digit inflation, skyrocketing crime and crippling food shortages.

Drawing rail-thin teenagers, elderly grandmothers and all ages in between, Venezuela's protests have taken on an almost ritual-like progression: Demonstrators begin marching toward their chosen destination and are blocked by police or national guardsmen in armored trucks launching plumes of tear gas.

The government's response to the demonstrations has drawn international condemnation, with U.S. Secretary of State Rex Tillerson expressing concern in April that Maduro is "not allowing the opposition to have their voices heard."

Maduro blames the opposition for the violence, claiming its leaders are instigating the unrest and working with gangs to remove him from power. At least two law enforcement officers have been killed in the demonstrations.