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Rod Speed

wrote in message news

On Tue, 17 Oct 2017 11:11:42 +0100
wrote:
On Tue, 17 Oct 2017 09:20:58 +0000 (UTC), wrote:

To allow for the worst case of "tilt and swing"[1] I believe.

[1]The angle the tractor unit can tilt and swing in respect to the
trailer before it contacts said trailer.

Huh? If the tractor has contacted the trailer other than through the 5th
wheel then the whole rig has already jackknifed. If you're talking about
manouvering in a tight yard then the shorter length of an EU tractor is a
lot
more useful than minor increase max angle which even for an EU unit is
probably around 100-120 degrees at a guess.

Would North American conditions sometimes require more tilt or in
other words a greater degree of articulation the vertical plane for
example in going over some their level/ grade crossings which in some
places are far from level.

I doubt they're any more severe than some of the humps and bumps of roads
around the UK.

Dunno, one of the odder things about that soggy little frigid
island is that there are **** all dirt roads used by semis.

We have hordes of them and some pretty 'interesting'
creek crossings, not bridge at all used by semis too.