One construction worker was killed and another critically injured on the Chesapeake Bay Bridge yesterday when a tractor-trailer and a van collided and swerved into a group of bridge repairmen.

A spokesman for the Maryland Toll Facilities Police said a driver pulled into an eastbound lane that was closed for construction and tried to sell bridge repairmen some tools from his van. The driver, whom the spokeman would not identify, then pulled out of the lane and into the path of a tractor-trailer. The vehicles collided and the van was dragged into a group of workers and two construction vehicles, the spokesman said.

One construction worker, William Brown, 59, of Baltimore, was taken to the University of Maryland Hospital's Shock-Trauma Unit and died shortly after, a hospital spokesman said. Anthony Moro, 23, of Baltimore, another construction man, is listed in critical condition.

Also treated at Anne Arundel General Hospital and released was Gansam Patel of Baltimore, a toll facilities worker.

As a result of the accident, the eastbound span of the 4.3 mile-bridge was closed for three hours. By noon traffic was backed up for 1 1/2 miles. Toll officials would not identify the van driver but said criminal charges are pending.