And the binder that is used is then inadequate for New Zealand summer conditions. I wonder why that might be?
Late last Northern summer I drove from L.A up the coast road to San Francisco, across to Yosemite, down to Bakersfield then on up and through Death Valley, Vegas and back to L.A. While there was certainly the odd repair, not once did we come across tar snakes or tar melt of any kind and I can assure you that the temperatures were higher in many places than some of the high temperatures we are having in some parts of NZ right now.
It is utterly ridiculous to build roads that melt in 22deg of ambient temperature. Yes better materials are more expensive , but I do not believe that the Public Servant Wombles in Wellington or most councils are are taking sufficient cognisance of the true cost of ownership, that's of course if they done the sums to find out in the first place.........
"Twilight's like soccer. They run around for two hours, nobody scores, and a billion fans insist you just don't understand"
The USA budgetted $1.75 trillion to get their roads up to scratch starting in 2009 so they've been doing well judging by your trip.
In NZ the binder is meant to be stable at an ambient 30 degrees C and is virtually the same as the one the yanks use. They also make roads just like ours (Hotmix Asphalt) but do use other additives sometimes.
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