sentences:  The model became so popular with both large and small bus operators that General Motors lost its position as the major manufacturer of such buses in North America, exiting the market entirely in 1980, two years after MCI updated the product with its MC-9 model.The U.S. Federal Highway Administration (FHWA) was a major participant, including sponsorship of the "International Vehicle and Highway Safety Conference," featuring discussions on international cooperation in vehicle and highway safety.A major attraction at Transpo 72 was a consolidated International Experimental Safety Vehicle Exhibit at which twelve different experimental safety vehicles were displayed.