I think roading does have some effect. If the west coast route and twin bridges are consistently narrow, very twisty and in places badly surfaced then road users will adjust their use of the road to match.
It would be interesting to know the nature of the SH1 and SH10 accidents. You may find they are head ons or collissions with road side furniture - both of which can be addressed via roading design.
This does not negate the need for driver training - but road design can make a road users bad decision result in a more serious accident.
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