March 29, 1977

Illus with Vance at beginning of Moscow talks

Pres Carter expected to require Fed agencies to prohibit use of motorcycles, motorbikes, snowmobiles, jeeps, dune buggies and other off-the-rd vehicles from areas of natl pks, wildernesses, forests, seashores and other public lands where they damage environment; Environmental Quality Council repts strong opposition to proposal; Sen James A McClure says it smacks of Eastern establishment thinking; Natl Wildlife Fed exec vp Thomas L Kimball hails it (M)

Pres Carter orders rev and possible upgrading of less-than-honorable discharges of approximately 432,000 Vietnam-era servicemen; Defense Sec Brown says program is being implemented in spirit of forgiveness and compassion; eligibility requirements noted (M)

SANTA CRUZ DE TENERIFE, Spain, March 28—With the airport here still littered with the charred remains of the two jetliners that collided on the runway yesterday in dense fog, the death toll rose today to 574, and investigators sought to determine how the crash had occurred.

Critical unknowns, confusion and contradictions faced investigators yesterday as they set out to reconstruct the events that led to the collision of two jumbo jets on a Canary Islands runway. There seemed to be good prospects that the cause of the catastrophe would emerge from electronic recording devices, interviews with crew members and other survivors from the Pan American World Airways plane, and interrogation of traffic controllers.