david davies
TRANSCRIPT
David DaviesPrincipal Maintenance Engineer
Highways & Traffic
Winter Operations
2
Winter ServiceWinter Service Why What How Future Developments Europe
Lincolnshire’s Winter ServiceLincolnshire’s Winter Service Policies Operations
3
Economic/Serviceability
Safety
Legal - Duty
Winter Service
Why ?
4
What Does the Law Require?
Section 41 of the Highways Act 1980 sets out the Council’s obligations, as a highway authority, for a winter weather service. The relevant extract of Section 41 reads as follows: -(b) (1) “In particular a highway authority are under a duty to ensure, so far as is reasonably practicable, that safe passage along a highway is not endangered by snow or ice.”
5
Salt bins
Self help – the misconception
6
Winter Service
What ?
Type of service:
Precautionary
Severe weather (Snow Clearance)
7
Winter Service
How ?
What Type of Materials: Salt
- Type- Size- Source
ABP’s Other chemicals Salt Grit
All have some ‘Environmental
Issues’
8
How does salt work
Alternatives to salt - cost
Salt does not remove snow
Salt forms Brine
9
Why Pre-Wet ?
More salt adheres to the road surface De-icing effect is achieved more quickly than dry
salt Increased longevity on the road surface More accurate spreading is possible Reduction in amount of salt used Longer spreading routes Reduction in third party claims
10
Winter Service
Developments
Combined Research via TRL
NWSRG Good Practice Guides Calibration
Highways Agency Reduced spread rates
11
European COST Winter Zones
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Lincolnshires Winter Service
Coastal
13
Winter Maintenance Policy and Plan
HM21: Winter Maintenance operations will give priority to a 2,990 KM network of priority routes, comprising the 1,200 KM Lincolnshire Strategic Road network plus links to all the County’s main villages. All treatments to be carried out using appropriate action for the prevailing conditions in accordance with national guidance and best practice.
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Winter Maintenance Policy and Plan
HM23: At times of severe weather treatment priorities will be as follows:1. Carriageways on the approved 2.990 km priority
route network.2. Secondary routes including carriageways leading
to essential industrial and military establishments, hospitals and health centres, schools and colleges, ambulance and fire stations, important bus and commuter routes.
3. Footways in accordance with HM24.
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Winter Maintenance Policy and Plan
HM24: During periods of severe weather the treatment of footways will be considered when resources permit. Footways to be treated will reflect their importance in the County’s footway hierarchy. The footway priority network for winter maintenance operations consists of:
1. Hierarchy 1 and 2 footways.2. Hierarchy 3 footways with gradients greater than 1 in 10
longitudinally for longer than 50 metres.3. Transport Interchanges (including footways to main car parks).4. Other known footways trouble spots.
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No treatmentNo treatment4
Snow removal will commence when resources come available from higher priority treatments. Endeavours will be made to commence clearance within 5 days of cessation of snowfall, subject to availability of resources. Treatment only during normal working hours.
Reactive treatment not normally undertaken other than in response to specific circumstances. Treatment only during normal working hours.
No treatmentNo treatment3
Snow removal will commence when resources come available from higher priority treatments. Endeavours will be made to commence clearance within 48 hours of cessation of snowfall, subject to availability of resources. Treatment only during normal working hours.
Monitor and treatment as required when resources permit. Treatment only during normal working hours.
No treatmentNo treatment2
Snow removal will commence when resources come available from higher priority treatments. Endeavours will be made to commence clearance within 24 hours of cessation of snowfall, subject to availability of resources. Treatment only during normal working hours.
Monitor and treatment as required when resources permit. Treatment only during normal working hours.
No treatmentNo treatment1
Snow removal will commence when resources come available from higher priority treatments. Endeavours will be made to complete clearance within 12 hours of cessation of snowfall, subject to availability of resources. Treatment only during normal working hours.
Monitor and further treatment as required when resources permit. Treatment only during normal working hours.
Precautionary treatmentNo treatment1a
Snow EventsExtended Ice ConditionsPersistent widespread ice (rather than
frost) for more than 18 hours in a 24-hour period and a forecast not to rise above zero for a further 18 hours in the next 24 hours.
Daytime Frost ConditionsOvernight forecast
temperatures below zero extending beyond 8am
Overnight Frost ConditionsOvernight forecast
temperatures below zero but not extending beyond 8am
Category
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Treated Network
Lincolnshire: 8,960 km of highway network started going pre-wet in 1998 operates 43 pre-wet frontline gritters treats 2,992 kms a turnout
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The Treatment System
Lincolnshire uses Brine saturators to produce a 23% brine solution
Bunce/Epoke pre-wet Pre-wet spread at a ratio of 70% dry salt / 30% brine
Spread rates of 10, 15 or 20 gms per m² High purity de-dusted 3mm or 6mm salt
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Decision Making
7 day/24hr manned office
Telephone
IceMan
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Length of the Treated Network
LINCOLNSHIRE COUNTY COUNCIL TREATED NETWORK LENGTH
2087 21
75
2186
2199
2225
2239 23
41
2361
2391
2400
2422
2430
2800
2862
2872
2922
2982
2989
2992
2992
0
500
1000
1500
2000
2500
3000
3500
90/91
91/92
92/93
93/94
94/95
95/96
96/97
97/98
98/99
99/20
00
2000
/01
2001
/02
2002
/03
2003
/04
2004
/05
2005
/06
2006
/07
2007
/08
2008
/09
2009
/10
Winter
Trea
ted
Leng
th
County Treated Network
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CalloutsLINCOLNSHIRE COUNTY COUNCIL PRECAUTIONARY SALTING CALLOUTS (County average)
60
67
50
45
40
69
58 58
89
73
77
84
47
84 83
99
63
56
86
92 93
52
77
96
118
10
14
1
1
1
8
2
3
1
51
2
1
7
3 31
4
2
0
20
40
60
80
100
120
140
85/8
6
86/8
7
87/8
8
88/8
9
89/9
0
90/9
1
91/9
2
92/9
3
93/9
4
94/9
5
95/9
6
96/9
7
97/9
8
98/9
9
99/2
000
2000
/01
2001
/02
2002
/03
2003
/04
2004
/05
2005
/06
2006
/07
2007
/08
2008
/09
2009
/10
Winter
Nu
mb
er
of
callo
uts
Turn outs & second runs Plough & Salt days
Budget based on 85 turnouts and 2 snow days
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Salt Usage
WINTER MAINTENANCE SALT USAGE
3140
0 3320
0
1380
0
1140
0
1460
0
2800
0
1700
0
1700
0
2700
0
2270
0
2700
0 2900
0
1280
0
2410
0
2160
0
2860
0
1680
0
1400
0
2410
0
2680
0
2730
0
1170
0
1904
0
2740
0
3361
0
0
5000
10000
15000
20000
25000
30000
35000
40000
85/86
86/87
87/88
88/89
89/90
90/91
91/92
92/93
93/94
94/95
95/96
96/97
97/98
98/99
99/20
00
2000
/01
2001
/02
2002
/03
2003
/04
2004
/05
2005
/06
2006
/07
2007
/08
2008
/09
2009
/10
Winter
Tonn
es
Policy is for 23000 tonnes of salt to be in stock at start of season
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Lincolnshire - Future Developments
Why ?
Safecote
Route Based Forecasting
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To remind us what Winter Maintenance is about
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Thank you.Thank you.
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Any Questions ?