The Italian Grand Prix to Stay--Trees and All : Motor racing: Formula One leaders reinstate event after safety measures are taken at Monza track.

The Italian Grand Prix is back on.

Three days after canceling the race, Formula One’s governing body on Monday said it was reinstating the Sept. 11 event following agreement on new safety measures at the Monza circuit.

The Federation International de L’Automobile (FIA) said it had approved a proposal for changes to the second Lesmo Corner.

“This solution, which changes the shape of the second Lesmo and reduces its speed, is acceptable to the FIA on the basis that it is for 1994 only,” FIA said in a statement. “As a result, the 1994 Italian Grand Prix has been reinstated on the calendar of the 1994 FIA Formula One Championship.”

The grandstand at the second corner will be removed and replaced with a gravel run-off area and new crash barriers, FIA spokesman Martin Whitaker said.

The angle of the corner will be made more acute, cutting speeds from approximately 161 m.p.h. to 105 m.p.h., Whitaker said.

Monza organizers had suggested putting chicanes between the two Lesmo Corners, but that was ruled out by FIA. No change will be made to the first corner.

FIA had scrapped the race last Friday after local officials refused to make circuit changes that would have required cutting down 123 trees. The demand to cut the centuries-old trees in the Monza public park had outraged environmentalists, and the city’s superintendent for environmental and architectural affairs, Lucia Gremmo, vetoed the felling of the trees last Wednesday.

Under Monday’s agreement, no trees will be cut down.

“It was either the trees that went or the grandstand,” Whitaker said.

FIA president Max Mosley agreed to the new changes--proposed by Monza organizers, FIA experts and drivers’ representative Gerhard Berger--following talks with Italian Premier Silvio Berlusconi.

“My government and I are very attached to the Italian Grand Prix and the Monza circuit,” Berlusconi told reporters Sunday. “We have done everything in our power to make the race go ahead Sept. 11.”

RAI state TV reported the “great satisfaction” of Cabinet secretary Gianni Letta, who, on behalf of Berlusconi, had met with Mosley on Saturday to press the government’s campaign that the race be run.

FIA stressed the changes are short-term only and it will be actively seeking a long-term solution for the circuit for 1995 and beyond.

Safety concerns in Formula One have been heightened since the deaths of Ayrton Senna and Roland Ratzenberger at San Marino Grand Prix in May.