The Mariposa Port of Entry at Nogales, Mexico, was shut down by Mexican truckers from 5:30 p.m. Monday to 8:30 p.m. Tuesday, according to Nogales International.com.

On March 10, U.S. Customs worked overtime to process the hundreds of cargo trucks, most carrying perishable produce from Mexico, that had been stuck in line.

The protesters were local truck drivers demanding that they not be charged tolls of about $11 on their return trips into Mexico, said Jose Luis Obregon, deputy director for the Nogales-based Fresh Produce Association of the Americas.

He said the situation had been an issue for several years.

The drivers have no alternative road to use instead of the toll road, also called the fiscal corridor.

The protesting truckers are local cruzadores – or "crossers" – who pick up trailers in Nogales, Sonora, and deliver them in Nogales or Rio Rico, AZ.

They were upset because they must pay a toll not just when they pass through tollbooths towing a load of tomatoes or other cargo, but also when they return southbound with empty trailers.

The actual blockade took place at the Mexican Customs station 12 kilometers, or 7.5 miles, south of the U.S.-Mexican border.

The financial impact of the blockade on the produce importers in Nogales and Rio Rico has not been calculated, and there are many factors involved.

A representative of the private company that has the concession to operate the toll road in Mexico agreed to a 15-day period to consider the requests of the truckers. During that time, the tolls for the backhauls won't be charged.