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Frontal visibility
coyoteboy - 24/5/11 at 12:36 PM

I'm a little confused by the frontal visibility (i.e. field of view from the drivers seat) regs in the manual, assuming a self-designed car. Does anyone have a basic explanation of it as I'm finding it a bit ambiguous.

[Edited on 24/5/11 by coyoteboy]

adithorp - 24/5/11 at 03:46 PM

Basic version...
You have to have an uninterupted view of the road ahead in an arc of 180degrees from the drivers seat. There's a list of bits that can stick up into this. Any aeroscreen must be below the imaginary line "C" in the appendix or its deemed a windscreen and has to have wipers, washers and demist.
Thats ambiguas. The manual is very specific... but complicated!

[Edited on 24/5/11 by adithorp]

coyoteboy - 24/5/11 at 03:57 PM

So how do roll cages and other structural members fall into that then? It seems to suggest split screens are OK as are A pillars but surely they could be notably larger than the 10mm allowed for screen supports etc and still be OK? I'm thinking an exo car with full cage build into the chassis design, much like the cadillac aera (concept) :


Thanks for clearing up the C line issue with aero screens, that makes sense now!



[Edited on 24/5/11 by coyoteboy]

loggyboy - 24/5/11 at 04:25 PM

quote:
Originally posted by coyoteboy
So how do roll cages and other structural members fall into that then? It seems to suggest split screens are OK as are A pillars but surely they could be notably larger than the 10mm allowed for screen supports etc and still be OK? I'm thinking an exo car with full cage build into the chassis design, much like the cadillac aera (concept) :

Thanks for clearing up the C line issue with aero screens, that makes sense now!

[Edited on 24/5/11 by coyoteboy]

NOTE 1: The following items do not constitute an obstruction to the field of
Vision. This is not an exhaustive list but provided as guidance:
- “A” pillars and split screen dividers
- Central windscreen stay or support (no wider in diameter than 10mm)
-fixed or movable vent or side window division bars
-outside radio aerials
- rear view mirrors
- windscreen wipers
- “radio aerial” conductors not exceeding the following width;
o embedded conductors – 0.5mm. o printed conductors – 1.0mm
- defrosting and demisting conductors not exceeding 0.03mm visible width
- steering wheel rim / instrument panel within wheel rim where highest part of
rim is at least 1° below the horizontal. (obtained as in Annex 1 of this section
by substitution of 1° in place of 4°).

[Edited on 24/5/11 by loggyboy]