On 19-Feb-18 6:55 PM, Tim Streater wrote:
In article , Nightjar
wrote:

On 19-Feb-18 2:14 PM, DerbyBorn wrote:
Was thiunking as I drove along a lane with deep ruts where the tarmac
met
the grass - and wondering what damage it may have done to the vehicle -
that such lanes are a problem - the tarmak crumbles at the edges and
keeps
breaking away.
Clearly constucting a road with curbs (kurbs?) woudld be costly - but
having seen a machine continuously casting a centre barrier I
wondered is a
machine could do it.

Imagine a rotating trenching mechanism - toothed wheel - followed up
by a
concrete mixing and filling machine - possibly dropping in some
reinforcement.

Could it work?

The problem with kerbs is that they trap water and require drainage to
be added. The simpler solution is to build the roads a couple of feet
wider and paint a white line a couple of feet in from the edge.

Good luck with that round here, such as at 51 15 53N, 1 04 08E. In
general your solution would require digging out banks and tearing down
hedges. Here's another where passing (even by cars) is just possible if
you drive up the bank: 51 12 20N, 0 59 07E.


That solution, which is one of the preferred DfT solution for rural
roads, is intended for predominantly flat countryside, where the side
rutting described by the OP is most likely. The rutting removes lateral
support to the road edge, which is then less able to resist heavy loads.
If the edge is restrained by substantial banks, it is far less prone to
that sort of damage.

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Colin Bignell