NHK has learned that the air traffic control instruction of "number 1" that indicates the order for planes to take off at Japanese airports will not be used for the time being.

The move comes after the misinterpretation of the phrase could have led to last week's deadly collision between a Japan Airlines passenger plane and a Japan Coast Guard aircraft on a runway at Tokyo's Haneda Airport.

The Coast Guard aircraft is believed to have mistakenly entered the runway after its pilot possibly misinterpreted "number 1" as clearance for takeoff. Traffic controllers and the JAL pilot were reportedly unaware of the aircraft's location.

NHK obtained a document concerning emergency safety measures compiled by the transport ministry following the accident.

The document says an air controller will give takeoff permission without informing pilots of their order. The measure will apply to Haneda and other airports across the country.

The numbers representing takeoff order are widely used at airports across Japan. They are used as practical information to facilitate smooth flight operations, rather than instructions by air controllers.

Other safety measures will require air carriers to closely monitor the runways from the cockpit during takeoff and landing.

The document also says authorities will make pilots more aware of air traffic control terms for entering the runway.

The stop line before entering the runway will be painted with more visible colors at airports, including Haneda, Narita, Osaka and Kansai.

The transport ministry has recently established a new air control post in charge of constantly monitoring a screen to confirm the locations of airplanes at Haneda Airport.