Land transport road assets - Waitakere City Auckland Region
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ISBN: 0-478-28992-8 land transport road assets
land transport road assets
Waitakere City
Auckland Region
Information as at June 2006
ISBN: 0-478-28992-8 land transport road assets 2
Purpose of this publication
Land Transport New Zealand annually publishes comparative information on the maintenance of
local authority roads. The information in this publication is based on financial assistance claimed
from Land Transport NZ in 2005/06 and on the annual achievement returns from each territorial
authority RAMM database.
This enables a comparison to be made between local authorities and their peers. It is also useful
as a benchmark for auditing and for reviewing of maintenance funding allocations.
This publication is also available on our website under Performance of Land Transport
(www.landtransport.govt.nz/information-for/local-transport-authorities.html).
Enquiries
For further information please contact Colin Tubb at Land Transport NZ’s National office in
Wellington, ph 04 916 4283 or email colin.tubb@landtransport.govt.nz
Feedback
We are keen to receive your feedback so that improvements can continue to be made. Please
contact the manager of performance information at your local Land Transport NZ office.
Northern Region 09 969 9800
Midland Region 07 958 8740
Central Region 04 931 8900
Southern Region 03 964 2866
Index
Section Sub-section Page
Purpose of this publication 2
Enquiries and feedback 2
Definition of terms 3
Physical road statistics 5
Road condition Smooth travel exposure for all sealed 6
roads
Surface condition 6
Pavement condition for all sealed roads 7
Road roughness 7
Maintenance costs Trends in road condition and structural 8
maintenance spend
Structural maintenance costs 8
Asset use Vehicle kilometres travelled on local 9
roads
Regional vehicle kilometres travelled 9
Work completed 10
ISBN: 0-478-28992-8 land transport road assets 3
Definition of terms
Approved Organisation (AO)
Transit New Zealand, the Auckland Regional Transport Authority (ARTA), a regional council, a territorial
authority, or any other approved public organisation.
Condition Index (CI)
Condition Index is a combined index, a ‘weighted sum’, of the surface faults in sealed road surfaces. CI
combines alligator cracking, scabbing, potholes, pothole patches and flushing.
100 - CI ensures that the higher the number, the better the condition.
CI and the routine for calculating it using the RAMM software, were introduced in the 2002/03 year.
Pavement Integrity Index (PII)
Pavement Integrity Index is a combined index of the pavement faults in sealed road surfaces. It is a
‘weighted sum’ of the pavement defects divided by total lane length. PII combines surface faults (CI)
with rutting and shoving.
100 - PII ensures that the higher the number the greater the pavement integrity.
Pavement integrity index (PII) and the routine for calculating it using the RAMM software, was intro-
duced in the 2003/04 year.
Road Roughness : >150 NAASRA counts
Road roughness is measured by a system developed by the former National Association of Australian
State Roading Authorities (NAASRA). Values are obtained by a special-purpose vehicle travelling down
both the outside lanes of length of road. The rougher the road, the higher the NAASRA counts per lane
kilometre.
Approved organisations define acceptable levels of service for roughness on their networks. The graph
provided in this document has used a threshold of 150 NAASRA. A NAASRA count of greater than 150
typically indicates a road which is becoming a concern in terms of its roughness and the number of com-
plaints likely to be generated.
Smooth Travel Exposure (STE)
Smooth Travel Exposure measures the proportion (%) of vehicle kilometres travelled in a year (VKT)
that occurs on ‘smooth’ sealed roads and indicates the ride quality experienced by motorists.
A ‘smooth’ road is one smoother than a predetermined NAASRA roughness threshold. The thresholds
used vary with traffic density and road location. Heavily trafficked roads have a lower (smoother) thresh-
old. High volume urban roads have lower roughness thresholds than low volume rural roads.
Structural Maintenance
Structural maintenance activity deals with the repair of the road (pavement and surface) and includes
the following work categories: pavement maintenance; area-wide pavement treatment; major drainage
control; maintenance chip seals; thin asphaltic surfacing; and seal widening.
Vehicle Kilometres Travelled (VKT)
VKT is the total annual vehicle kilometres travelled in an area. This is calculated from the number of ve-
hicles crossing a point in both directions in a 24 hour period, times the length of the road being trav-
elled. Individual road VKT is added to give a value for the whole road network in that area.
Work Category
Claims for funding from Land Transport New Zealand are made within work categories. Some work cate-
gories are explained on page four. For further explanation of individual work categories please refer to
the Land Transport New Zealand ‘Programme and Funding Manual’ on our website
http://www.landtransport.govt.nz/funding/programme-and-funding-manual/
ISBN: 0-478-28992-8 land transport road assets 4
Definition of terms (contd)
Area-wide Pavement Treatment (work category 2)
Area Wide Pavement Treatments are structural pavement treatments applied to substantial lengths
of roads, including large areas requiring digout and replace, or recycling.
Pavement Smoothing (work category 40)
This work category covers the smoothing of pavements for the benefit of road users. Examples in-
clude: thin asphaltic overlays or grader-laid asphaltic material; unbound granular overlays; treat-
ments involving ripping and/or reshaping, including stabilisation of the existing pavement material;
certain urban treatments, where this is the most cost-effective option for pavement smoothing, in-
cluding replacement of the kerb, removal and replacement of the existing pavement material.
Road Reconstruction ( work category 39)
This involves the reconstruction of existing pavements within the existing or widened road reserve or
deviations onto a new road reserve where the original road is closed. Examples include: realignment,
re-grading, widening, intersection improvements.
New Roads and Bridges (work category 38)
This covers the construction of a new road which is additional to the existing roading system and
may include new bridges.
Bridge Renewals (work category 35)
Work category 35 covers the following work: replacement of a structurally inadequate bridge; replac-
ing a bridge for non-structural reasons, such as inadequate width or waterway; structurally modifying
an existing bridge to increase its structural capacity to a level higher than originally provided; widen-
ing an existing bridge.
Seal Extensions (work category 42)
Seal extensions involve sealing existing unsealed roads, including any reconstruction.
Construction projects
Construction projects cover the following work categories: traffic management; crash reduction stud-
ies; bridge renewals; new roads and bridges; road reconstruction; pavement smoothing; seal exten-
sion; transportations studies; strategy studies.
ISBN: 0-478-28992-8 land transport road assets 5
Physical road statistics for 2006
Waitakere City
Auckland Region
Territorial authority
(TA) Region Nation
Tota l roa d ne tw ork Sta te Highw a y 327 10,895
(km) Loca l 808 7,748 82,565
Se a le d roa d ne tw ork Sta te Highw a y 326 10,838
(km) Loca l 767 6,585 49,811
Sta te Highw a y 106 171
Motorw a ys (km)
Loca l - -
Sta te Highw a y -
C ycle w a ys (km)
Loca l 6 42 302
Sta te Highw a y 299 3,983
Tota l bridge s (#)
Loca l 72 1,059 13,589
Tota l bridge s (le ngth Sta te Highw a y 23,362 138,937
m) Loca l 1,349 6,585 236,386
Single la ne bridge s Sta te Highw a y - 175
(#) Loca l 9 283 7,337
Single la ne bridge s Sta te Highw a y - 12,885
(le ngth m) Loca l 132 4,111 141,372
Spe e d re stricte d Sta te Highw a y - 12
bridge s (#) Loca l 1 1 137
Spe e d re stricte d Sta te Highw a y - 948
bridge s (le ngth m) Loca l 6 6 4,197
W e ight re stricte d Sta te Highw a y - 3
bridge s (#) Loca l 1 15 491
W e ight re stricte d Sta te Highw a y - 324
bridge s (le ngth m) Loca l 20 281 12,055
Sta te Highw a y - 15
Timbe r bridge s (#)
Loca l 3 21 914
Timbe r bridge s Sta te Highw a y - 843
(le ngth m) Loca l 34 212 11,355
Source: Territorial authorities and Transit NZ.
Note 1: All lengths rounded to whole metres.
Note 2: Regional and national figures include Department of Conservation and Waitangi Trust roads.
ISBN: 0-478-28992-8 land transport road assets 6
Road condition
Smooth travel exposure for all sealed roads in Waitakere City
100%
95%
Smooth travel exposure (STE) %
90%
85%
80%
75%
70%
65%
60%
55%
50%
2000 2001 2002 2003 2004 2005 2006
Year (ending June)
Waitakere City - urban NZ territorial authorities - urban
Waitakere City - rural NZ territorial authorities - rural
Waitakere City - network NZ territorial authorities - netwo rk
Note: the higher the smooth travel exposure (STE) % the smoother the network.
Source: RAMM information from Territorial authorities (does not include Transit NZ data).
Surface condition in Waitakere City
100
100 - Condition index (100 - CI)
95
90
85
80
75
2000 2001 2002 2003 2004 2005 2006
Waitakere City - urban Y ear (ending June)
NZ territorial authorities - urban
Waitakere City - rural NZ territorial authorities - rural
Waitakere City - netw ork NZ territorial authorities - netw ork
Notes: the higher the value of 100 - condition index (CI), the fewer the defects in the sealed road surface.
CI and the routine for calculating it using the RAMM software, were introduced in the 2002/03 year.
Source: RAMM information from Territorial authorities (does not include Transit NZ data).ISBN: 0-478-28992-8 land transport road assets 7
Pavement condition for all sealed roads in Waitakere City
100
98
100 - Pavement integrity index
96
94
(100 - PII)
92
90
88
86
84
2000 2001 2002 2003 2004 2005 2006
Y ear (ending June)
Waitakere City - urban NZ territorial autho rities - urban
Waitakere City - rural NZ territorial autho rities - rural
Waitakere City - network NZ territorial autho rities - network
Notes: the higher the 100 - pavement integrity index (PII) value the better the pavement structural
condition. Pavement integrity index (PII) and the routine for calculating it using the RAMM software, was
introduced in the 2003/04 year.
Source: RAMM information from Territorial authorities (does not include Transit NZ data).
Road roughness for Waitakere City
18
16
% lane km > 150 NAASRA
14
12
10
counts
8
6
4
2
0
2001 2002 2003 2004 2005 2006
year (ending June)
W aitakere City Auckland Region
North Island total New Zealand total
Note: the higher the percentage the rougher the network
Source: RAMM information from Territorial authorities (does not include Transit NZ data).ISBN: 0-478-28992-8 land transport road assets 8
Maintenance costs
Trends in road condition and structural maintenance spend for
Waitakere City *
12.0 100
90
10.0
80
70
percentage (%)
8.0
cost ($ millions)
60
6.0 50
40
4.0
30
20
2.0
10
0.0 0
2001 2002 2003 2004 2005 2006
year (ending June)
structural maintenance ($M) smoothness (STE)
pavement integrity (100 - PII) surface condition (100 - CI)
Notes: the higher the percentage (%) the better the network condition.
* for maintenance funded through Land Transport NZ only. Land Transport NZ and Approved Organisation share.
Source: Land Transport New Zealand
Structural maintenance costs for Waitakere City*
12.0
10.0
costs ($million)
8.0
6.0
4.0
2.0
0.0
2001 2002 2003 2004 2005 2006
year (ending June)
general maintenance area-wide pavement treatment
major drainage control reseals
bridge maintenance pavement smoothing
Note: Regional Council and Transit NZ costs are excluded.
* for maintenance funded through Land Transport NZ only. Land Transport NZ and Approved Organisation share.
Source: Land Transport New ZealandISBN: 0-478-28992-8 land transport road assets 9
Asset use
Waitakere City vehicle kilometres travelled on local roads
1,200
vehicle kilometres travelled (VKT)
1,000
800 2007
projection
(million km)
600
400
200
0
2000 2001 2002 2003 2004 2005 2006
year (ending June)
W aitakere City linear trend with projection
Source: Territorial authorities (does not include Transit NZ data).
Auckland Region vehicle kilometres travelled
14,000 35%
vehicle kilometres travelled
12,000 30%
(VKT) (million km)
10,000 25%
% of total
8,000 20%
6,000 15%
4,000 10%
2,000 5%
0 0%
2001 2002 2003 2004 2005 2006
year (ending June)
state highways
local roads
TA local roads as % of region local roads
all region roads as % of NZ
Source: Territorial authorities (TAs) and Transit NZland transport road assets 10
Work completed in 2005/06 (June year)
Territorial
authority
(TA) Region Nation
Sta te Highw ay la ne kms 60.7 1,184.9
Re se a ls
Local la ne kms 58.0 982.1 5,447.8
Sta te Highw ay la ne kms 0.2 6.7
Pave me nt Smoothing
Local la ne kms 1.7 48.5 248.3
Sta te Highw ay la ne kms - 82.5
Roa d Re construction
Local la ne kms - 10.6 281.2
Are a W ide P ave me nt Sta te Highw ay la ne kms 6.4 170.3
Tre a tme nt Local la ne kms 2.7 129.3 738.3
Sta te Highw ay la ne kms - 3.6
Ne w Roa ds & Bridge s
Local la ne kms 0.1 67.5 144.8
Sta te Highw ay No. - 4
Auckland Region
Sta te Highw ay la ne me tre s - 2,900.0
Bridge Re ne w a ls
Waitakere City
Local No. - 2 35
Local la ne me tre s - 19.0 491.6
Sta te Highw ay No. - -
Sta te Highw ay la ne kms - -
Se a l Exte nsion
Local No. 1 15 88
Local la ne kms 1.3 26.6 208.8
Construction P roje cts Sta te Highw ay No. 8 63
Comple te d Local No. 15 56 205
ISBN: 0-478-28992-8
Source: Territorial authorities and Transit NZ.ISBN: 0-478-28992-8 land transport road assets 11
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