Suffolk police screened more than 1,000 vehicles through a checkpoint on Godwin Boulevard Friday evening.

“It was very successful,” said Suffolk Police Department Major Stephanie Burch.

Police made four arrests for driving under the influence of alcohol, two for possession of marijuana, one for an open container of alcohol and one for an outstanding warrant for failure to appear.

They also issued 111 summonses for traffic violations, including 17 for safety belt violations, Burch said.

She added that four drunken driving arrests during a checkpoint is more than usual. At a checkpoint on St. Patrick’s Day earlier this year, police made only one arrest for driving under the influence.

The city has grant funding from the National Highway Traffic Safety Administration to do a checkpoint every quarter. Police typically choose roads with high crash numbers to conduct the safety operations, Burch said.