A motorist, allegedly fleeing after a hit-and-run collision with a Nigerian Embassy vehicle, was killed in a fiery accident late Saturday after the car he was driving struck a railing on a ramp leading from the Baltimore Washington Parkway to Kenilworth Avenue, U.S. Park Police said yesterday.

Police said that the driver, described as in his early forties, was pronounced dead shortly before midnight after he apparently lost control of the car, which rolled down an embankment, struck a tree and burst into flames.

The car, a 1976 Buick with Virginia tags, previously struck a station wagon belonging to the Nigerian Embassy at a stop sign at a nearby ramp leading from Kenilworth Avenue to the southbound parkway, police said.

The driver of the embassy vehicle, identified as Kolawole Robinson, was not injured, police said. Authorities said they had not established whether Robinson is an embassy employe, and embassy officials could not be reached for comment. The vehicle, a 1985 Oldsmobile station wagon, received minor damage, police said.

The driver of the Buick sped away after the collision with the embassy vehicle, police said. Authorities said that speed, alcohol and drugs may have been factors in the accidents.