Always a back straight, your car is travelling at its quickest, if its under the rostrum you need to move your head as well as your eyes to track you car - your peripheral vision is also less as you're looking at a much reduced portion of the track hence harder to avoid obstacles/cars, and of course your car is flat out so probably wont come out of an incident. I agree with dans statement but if the rostrum is set back from its nearest lane your vision for obstacles will be fine.
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