Robert Woolley wrote in message . ..
On Thu, 14 Aug 2003 23:13:19 +0100, David Cowie
wrote:

The latest use of taxpayers money in SW London seems to be putting
anti skid surfaces down before pedaestrian crossings. At least 10m
long or more. Spose some calculations were done on travelling at 30mph
and stopping distances.

Biggest waste has to be on the uphill section up East Hill (A3) in
Wandsworth before the crossing. Never experienced anyone going faster
than 10mph here (admittedly in rush hour)

Traffic tends to move faster off-peak.

I suppose the length should be adjusted to allow for speed limits and
gradient.

Traffic always moves faster off-peak, don't know the site but that may
well be when the safety benefit of the crossing (and the anti-skid) is
greatest.

Another factor that may have been considered is the age of the road
surface. When a surface is first laid it has a very high
skid-resistance (as good as anti-skid) which then gradually
deteriorates over time (within acceptable tolerances, the road should
be re-surfaced before it goes too low ). Anti-skid is rarely needed
on top of a new road-surface - there will be no need for some time.
It is used later to restore maximum skid-resistence at places where
sudden braking is most likely to occur i.e. crossings & junctions.