BOSTON -- Massport instituted several changes at Logan International Airport to increase airfield safety after a construction vehicle narrowly missed colliding with a plane on a runway last week.

On the morning of June 18, the vehicle crossed Logan's runway 15R in front of a commercial jet that was traveling at about 158 mph after it was cleared for takeoff. The driver said that he did not know the runway was active, according to a preliminary report released by the National Transportation Safety Board.

All airfield driving privileges for airfield construction contractors have been eliminated, no private contractors will be allowed to drive on the airfield without a dedicated contractor airfield escort, and escort drivers must call the Massport shift manager at the start of their shift and confirm the runways in use.

Massport said that if construction requires that an active runway be crossed, operations personnel will be in position to oversee such crossings and communicate with air traffic control prior to any crossings.

Officials have voluntarily suspended airfield construction, and it is expected to resume on Monday when the new procedures are in place. The National Transportation Safety Board and the Federal Aviation Administration have been notified of the new procedures.

The NTSB report released Wednesday that it appeared the tower controller was aware of the Ford Explorer operating on the taxiway, but not its intention to cross. The ground radar alerted the controllers of the event.

The truck, which is owned by HNTB Inc., and the US Airways jet were just 1.4 seconds from colliding in what would have been a certain disaster, investigators said.

US Airways Flight 27, an Airbus A320, was departing Boston for Phoenix with 84 passengers and five crew members aboard. The pilot reported the runway incursion, but continued the flight without further incident and landed safely in Phoenix.

The incident remains under investigation by the NTSB and the FAA.