David Hansen wrote:
On Fri, 20 Jun 2008 09:32:26 +0100 someone who may be Rod
wrote this:-

Actually enforcing speed limits would be a fuel/emission saving
measure.

Around here (and, I am sure in mahy other parts of the world),
"enforcing" speed limits has been done by much speed hump building.

Enforcing speed limits can be done in a variety of ways, of which
this is just one.


So perhaps:

Actually enforcing speed limits *could* be a fuel/emission saving
measure. In reality, badly thought through implemntation
sometimes/often/always [1] cause an increase in fuel usage/emissions.

[1] Choose one.

Another exmaple very close to me. Major hill out of town. Became largely
30 mph and rigorously enforced often by mobile speed traps. Result -
huge queues and very slow moving traffic. Change to 40 (yes - it is very
rare to hear of an increase these days) and traffic improves
considerably. Again, I strongly suspect that the 30mph limit, enforced,
actually caused more fuel usage/emissions than the current 40 mph.

--
Rod

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