The prototypes probably come off the Ford Chicane a good piece faster to begin with.
For the length of the circuit (8.625-miles), 60 cars isn't that many. They have had 70-80+ at Daytona and Sebring.
As for issues with run-off, tire barriers backed by catch fencing work very well to absorb the impact and protect both the drivers and spectators.
Why did they put in the Dunlop Chicane in the first place, with the Ford Chicane, that flat-out run is relatively short, and they used to be able to pass in the Esses. Now, approach speeds are too slow to have much of that, and with those extra curvs it's not a straight shot in anymore. Also, the proper racing line into the Dunlop Chicane doesn't really allow for much competitve passing there either.
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