Why aren't roads "dual compound?"

[Red Herring]

Originally Posted by punyXpress

But . .
With a slight redesign of the surface course laying tackle, you would not need additional longitudinal joints:
Have TWO hoppers for the material, nearside with harder compound.
Even better would be a third in the middle of each lane with super-grippy - just for bikes ( and the front wheel of Reliants.

Apart from the sensible technical answer already given can you imagine how interesting this would be to ride on? Personally I don't ride around a bend a constant distance from the kerb, I take a line appropriate to the view, the road conditions and other traffic. I'm not particularly bothered about the level of grip available, only that it is reasonable consistent which under this proposal it wouldn't be.

[punyXpress]

Sorry - omitted my
The last thing we want ( or need ) is being limited to the middle 1/3 of the left hand lane!

[Red Herring]

Originally Posted by punyXpress

Sorry - omitted my
The last thing we want ( or need ) is being limited to the middle 1/3 of the left hand lane!

You mean the bit where all the grit, dust, discarded nails and other rubbish collects because it isn't driven on by cars...?