Council Minutes - Town of Cambridge

COUNCIL MINUTES
TUESDAY 20 DECEMBER 2011
The main components of this strategy are:-
Distributor Roads - Total length 45.5 kilometres which includes 7.6 kilometres of dual
carriageway and traffic volume greater than 2,000 vehicles per day. Most will qualify for
MRRG grants depending on condition. Resurfacing is scheduled at a surface age of 20
years. This means that an average of 2.3 kilometres per year will require resurfacing. In
practice, distributor roads have required resurfacing at a seal age between 15 and 25
years in the Town.
Local Access Roads - Total length 121 kilometres. Traffic volume less than 2,000
vehicles per day. Resurfacing is scheduled every 30 years depending on condition. This
means that an average of 4 kilometres per year will require resurfacing. In practice, local
access roads have required resurfacing at a seal age between 25 and 35 years in the
Town.
Condition of Precast Kerb - If short sections of precast kerb are misaligned then work is
programmed to re-lay these sections. If long sections of kerb are deteriorated or are too
low, then they are replaced with extruded kerb. This has been done on a large scale, for
example on Oceanic Drive, Challenger Parade and The Boulevard Service Road. The
need for kerb replacement will increase over the next 20 years as the precast-kerbs
reach the end of their useful lives. The replacement of kerb is a substantial item in this
asset management strategy. At present, the replacement of kerb is deferred until it has
become necessary due to a serious lack of kerb height or a significant number of kerb
sections are broken or misaligned. The average value of kerb replacement currently
ranges from $0 to approximately $160,000 each year. The report recommends that the
Town considers replacing more kerbing to improve the cosmetic appearance of streets
and construction standards. If kerb is not replaced at this opportunity, then it has to be
good enough to last until the road is next resurfaced in 20-30 years time.
Lanes - Traffic volume less than 200 vehicles per day. Total length 21 kilometres (14
kilometres sealed). Schedule resurfacing every 30 years depending on condition. Two of
the older lanes have been resurfaced in the last 10 years and more will be required in
future years.
Laneways will need to be added to the road resurfacing program as their seal age
reaches 30 years. It is anticipated that funding of $65,000 per year will be required for
resurfacing all 21 kilometres of lanes. This should coincide with the completion of the
current lane upgrading program in approximately 10 years time that currently has funding
of $300,000 per year.
Condition of the Asphalt Seal - The condition of the asphalt is determined visually and
a rating is given for asphalt type, surface defects, extent of patching, cracking, rutting and
bitumen binder condition. The condition of the asphalt at the time of inspection will
depend on its age, the original standard of road construction, type of sprayed seal or
asphalt used for the wearing surface and traffic loading. As asphalt seals age, the
cracking, rutting, defects, and binder condition all get progressively worse until one of
them reaches an intervention level that dictates that the road must be resurfaced. These
values are then assessed by a computer program to rank each section of road into a 20
year program. The computer program uses a deterioration algorithm that predicts when
each section of road requires resurfacing. The current standard road asset management
computer software is ROMAN II and is currently supported by WALGA.
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