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Vehicle travel speed that is not exceeded by 85% of
vehicles. |
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Average Annual Daily Traffic volume |
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Bitumen Surfacing Inspection System.
A rating method developed by VicRoads
for five condition criteria for flush seals and asphalt wearing courses.
Assessments are made for amount and severity of cracking, loss of
aggregate, amount of maintenance patching, binder level and bitumen
condition (hardening). BSIS
produces a score to indicate reseal priority: 0 – 5
Very low 5 – 10
Low 10 – 15 Medium 15 – 20 High 20 – 25 Very
High 25 – 30 Urgent |
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California Bearing Ratio. A test to measure strength and bearing capacity of subgrade
material (Ref AS 1289). The CBR is the ratio expressed as a percentage of
the penetration resistance of a soil to the penetration resistance of a
standard crushed rock. |
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Corporate overheads |
Indirect costs of work incurred as corporate services
including administrative processing, payroll, human resources, information
technology, financial services, general management and governance. |
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The current cost of replacing the original service
potential of an existing asset, with a similar modern equivalent asset, ie
the total cost of replacing an existing asset with an as NEW or similar
asset expressed in current dollar values. |
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Direct costs incurrent in work including direct labour,
labour on-costs, plant hire, contract payments, materials, and direct
supervision. Excludes engineering overheads and corporate/ management
overheads. |
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The estimated or expected time between placing the asset
into service and removing it from service, in other words the estimated
period of time over which the future economic benefits embodied in a
depreciable asset are expected to be consumed by the council. It is the
same as the useful life. |
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Indirect costs for engineering work incurred in design
and general supervision of projects and management of the engineering
services function. |
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For unsealed roads, the total width of unsealed pavement
and shoulders. |
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Frequency that maintenance grading is undertaken on an
unsealed road. |
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Quality analysis of gravel road materials by observed
performance on the road by Lea, Paige & Green, 1999, RTR.
The performance of the gravel material is assessed by the gravel
material’s shrinkage product and grading co-coefficient where the
shrinkage product (SP) = linear shrinkage x % passing 0.425 mm sieve and
the grading co-efficient (Gc) = (% passing 26.5 mm sieve - % passing 2 mm
sieve) x (% passing 4.75 mm sieve) / 100.
The results are plotted on a
graph
to indicate the gravel material quality.
The method is detailed in
Shepherd, D. To determine the
quality of your gravel material from material grading analysis
click
here. |
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Periodic pavement maintenance |
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Renewal (replacement) of gravel pavement of unsealed
roads to replace gravel lost from wind and rain erosion, traffic, etc.
Resheets are usually undertaken to a compacted depth of 50 – 200
mm on a 3 – 15 years cycle. |
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Renewal of pavement wearing surface by spray seal,
asphalt or associated materials. |
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Day to day operational activities to keep the
asset operating and which form part of the annual operating budget,
including preventative maintenance. This
includes: Routine pavement maintenance ·
Pothole patching ·
Minor regulation ·
Crack sealing ·
Minor surface treatment ·
Pavement sweeping ·
Edge repairs ·
Digouts/patching (<2m2 isolated to pavement failures) ·
Unsealed road grading Shoulders maintenance ·
Unsealed shoulder grading ·
Minor sealed shoulder repairs ·
Drainage ·
Cleaning surface drains (inc. verge drains & back
drains) ·
Cleaning sub-surface drains ·
Culvert & pit cleaning and repairs Operational ·
Reinstate road openings ·
Emergency works (inc cleanups & traffic control) ·
Emergency patching (eg due to burst water mains) Source: VicRoads Maintenance Work Types |
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Non built-up areas where the frontage is generally other
than residential, commercial or industrial (Source: Vic Grants
Commission). |
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Application of asphalt to pavement that provides
additional structural strength to the pavement. Generally greater than 40mm in thickness. |
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Spray seal |
Surface or wearing course of sprayed bituminous binder
and layer(s) of aggregate. Also known as flush seal and chip seal. |
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Improvement to rideability of a pavement by filling of
depressions with asphalt or bituminous ‘cold mix’. Usually undertaken
prior to resurfacing. |
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Work to prepare a pavement wearing surface for reseal
including pothole patching, surface regulation, minor and major patching. |
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Built-up areas where the predominant frontage of streets
and roads is residential, commercial or industrial and where there is
generally street lighting and/or a 60 km/h (or less) speed limit (Source:
Vic Grants Commission). |
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