Highway Safety Manual - Florida Department of Transportation
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Transcript Highway Safety Manual - Florida Department of Transportation
Highway Safety Manual
Implementation
DISTRICT PILOT PROJECT PRESENTATION
MAY 2, 2011
1
Highway Safety Manual
Implementation
Presentation Outline
Overview of the Highway Safety Manual Implementation
Plan
Update of the Development of SPF Calibration Factors
Available SPFs and CMFs
Sample Pilot Project Description and Analysis
Request for Pilot Project Descriptions
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5
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CO & DISTRICT CHAMPIONS
Assign Top-Level District Champions
Participate in Top-down management presentations with
the Central Office champions (Bob Romig, Brian Blanchard
and Marianne Trussell)
Actively promote, support and advocate the benefits of
implementing the Highway Safety Manual
Monitor pilot projects and implementation progress
Conduct recognition ceremonies for pilot project
participants
Submit District Champion counterparts from
Transportation Development and Operations to Marianne
Trussell, Chief Safety Officer by April 29, 2011.
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CALIBRATION OF THE HIGHWAY SAFETY
MANUAL TO FLORIDA CONDITIONS
OVERVIEW
Calibration factors for fatal and injury models
only
KAB and KABC
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IDENTIFY FACILITY TYPES
FDOT Prioritized Segments
Rural two-lane roads
Rural multilane divided roads
Urban multilane divided arterials
Additional segments
Urban two-lane undivided arterials
Urban two-lane with TWLTL
Urban four-lane undivided arterials
Urban four-lane with TWLTL
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FDOT PRIORITY FACILITY TYPES
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COMPUTE CALIBRATION FACTOR
C
observedcrashes
predictedcrashes
all sites
all sites
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RURAL TWO-LANE ROADS
N = AADT × L × 365 × 10-6 × e(-0.312)
CMFs with available data
Lane width, shoulder width, shoulder type, TWLTL,
lighting
CMFs values assumed
Grade, driveway density, roadside hazard rating
HSM default values used
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RURAL TWO-LANE ROADS
Rural 2 Lane Calibration Factor
2005
2006
2007
2008
1.352
1.375
1.244
1.220
KAB
1.363
1.063
1.235
1.071
1.027
0.982
KABC
1.067
1.007
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RURAL MULTILANE DIVIDED ROADS
N = exp[ a + b × ln(AADT) + ln(L) ]
Crash Severity Level
b
4-lane fatal and injury (KAB)
-8.837
0.958
4-lane fatal and injury (KABC)
-8.505
0.874
CMFs with available data
a
Lane width, right shoulder width, median width, lighting
CMFs with values assumed
None
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RURAL MULTILANE DIVIDED ROADS
Rural 4 Lane Divided Calibration Factor
2005
2006
2007
2008
0.777
0.760
0.746
0.695
KAB
0.768
0.724
0.721
0.703
0.708
0.671
KABC
0.713
0.689
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URBAN ARTERIALS
CMFs with available data
Median width, on-street parking, lighting
CMFs with values assumed
Roadside fixed objects
CMF
assumed to be 1.0
Driveway density
CMF
assumed to be 1.0
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URBAN 2 LANE UNDIVIDED
Urban 2 Lane Undivided Calibration Factor
2005
2006
2007
2008
1.103
1.009
1.139
0.947
KABC
1.057
1.044
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URBAN 2 LANE WITH TWLTL
Urban 2 Lane with TWLTL Calibration Factor
2005
2006
2007
2008
0.916
1.184
1.105
1.073
KABC
1.051
1.089
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URBAN 4 LANE DIVIDED ARTERIALS
Urban 4 Lane Divided Calibration Factor
2005
2006
2007
2008
1.758
1.637
1.681
1.609
KABC
1.697
1.646
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URBAN 4 LANE UNDIVIDED
Urban 4 Lane Undivided Calibration Factor
2005
2006
2007
2008
0.627
0.743
0.777
0.697
KABC
0.685
0.738
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URBAN 4 LANE WITH TWLTL
Urban 4 Lane with TWLTL Calibration Factor
2005
2006
2007
2008
0.749
0.765
0.735
0.708
KABC
0.744
0.698
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BIKE LANES – URBAN 4 LANE DIVIDED
Without bike lane separation
With bike lanes
Without bike lanes
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2007-2008 CALIBRATION SUMMARY
INTERSECTION DATA
Data Needs
Rural and Urban
AADT,
Crashes, skew, left-turn lanes, right-turn lanes,
lighting,
Urban only
pedestrian
activity, left-turn signal phasing, right-turn-onred, red-light cameras, bus stops, schools, alcohol sales
establishments
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INTERSECTION DATA
Crash Analysis Reporting System
Geometric characteristics?
Lat, long coordinates?
FDOT Intersection Study
Signalized: no geometry, no 2nd AADT
Un-signalized: no AADT
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SAMPLE PILOT PROJECT
SR 44 from Hill Avenue to West of CR 4139 is a rural 2-lane
undivided roadway with curved roadway segments. Five
curves exist within the project limits and one curve would
require a design exception for super-elevation. Equation 10-6
(HSM-Part C) and the applicable CMFs (HSM-Part D) will be
used to predict crashes for the roadway segment that includes
Curve 1 and determine if a design exception is justified.
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SAMPLE PILOT PROJECT
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SAMPLE PILOT PROJECT
The following information is available:
1. Length of segment: 0.10 miles
2. AADT: 17,300 in 2010 (opening year); 26,600 in 2030 (design year)
3. Grade: 0.0%
4. Radius of curve: 573’
5. Driveways per mile: 2
6. Lane width: 12’
7. Shoulder width: 4’
8. Shoulder type: paved
9. Roadside hazard rating: 2 (based on 18’ CZ with 1:4 front slopes)
10. Curve length: 0.06 miles
11. Existing e: 3.5% (eastbound) and 0.0% (westbound)
12. Required e: 10.0%
13. Calibration factor: 1.01
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SAMPLE PILOT PROJECT
Apply the appropriate SPF
N = AADT × L × 365 × 10–6 × e (–0.312)
= 17,300 × 0.163 × 365 × 10–6 × e (–0.312) = 0.753
crashes/year
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SAMPLE PILOT PROJECT
Adjust the estimated crash frequency to the site
specific geometric conditions
1. CMF1r = (CMFra – 1.0) x pra + 1.0 =
= (1.0 – 1.0) x 0.40 + 1.0 = 1.0
2. CMF2r = (CMFwra x CMFtra – 1.0) x pra + 1.0 =
= (1.15 x 1.0 – 1.0) x 0.70 + 1.0 = 1.11
3. CMF3r =
=
(1.55 x Lc) + (80.2 / R) – (0.012 x S)
(1.55 x Lc)
(1.55 x 0.06) + (80.2 / 573) – (0.012 x 0)
(1.55 x 0.06)
=
= 2.51
Note: CMF1r => lane width; CMF2r => shoulder width and type;
CMF3r => horizontal curvature
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SAMPLE PILOT PROJECT
4. CMF4r = 1.06 + 3(SV - 0.02) =
= 1.06 + 3(0.10 - 0.02) = 1.30
5. CMF5r = 1.0 (grade < 3%)
6. CMF6r = 1.0 (less than 5 driveways / mile)
7. CMF7r = 1.0 (no rumble strips)
8. CMF8r = 1.0 (no passing lanes)
9. CMF9r = 1.0 (no TWLTL)
Note: CMF4r => super-elevation variance
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SAMPLE PILOT PROJECT
10. CMF10r =
e(-0.6869 + 0.0668 x RHR)
=
(-0.4865)
e
e(-0.6869 + 0.0668 x 2)
e(-0.4865)
= 0.94
11. CMF11r = 1.00 (no roadway lighting)
12. CMF12r = 1.00 (no automated speed enforcement)
CMFcomb = 1.11 x 2.51 x 1.30 x 0.94 = 3.41
Note: CMF10r => roadside hazard rating = 2 (based on 18’CZ
with 1:4 front slopes).
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SAMPLE PILOT PROJECT
Npredicted-rs = 0.753 x 3.41 x 1.01 = 2.59 crashes/year
Annual KABC Cost of Crashes (existing conditions)
Fatal = 0.013 x 2.59 x $6,380,000 = $214,815
Incap. = 0.054 x 2.59 x $521,768 = $72,974
Nonincap. = 0.109 x 2.59 x $104,052 = $29,375
Poss. Injury = 0.145 x 2.59 x $63,510 = $23,851
ANNUAL CRASH COST (existing conditions)= $341,015
Note: crash costs from STATE SAFETY OFFICE BULLETIN 0-01 or
ROADWAY DESIGN BULLETIN 10-09
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SAMPLE PILOT PROJECT
Adjust the estimated crash frequency to the site
specific geometric conditions (build)
1. CMF1r = (CMFra – 1.0) x pra + 1.0 =
= (1.0 – 1.0) x 0.40 + 1.0 = 1.0
2. CMF2r = (CMFwra x CMFtra – 1.0) x pra + 1.0 =
= (1.15 x 1.0 – 1.0) x 0.70 + 1.0 = 1.11
3. CMF3r =
=
(1.55 x Lc) + (80.2 / R) – (0.012 x S)
(1.55 x Lc)
(1.55 x 0.08) + (80.2 / 750) – (0.012 x 0)
(1.55 x 0.08)
=
= 1.86
Note: CMF1r => lane width; CMF2r => shoulder width and type;
CMF3r => horizontal curvature
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SAMPLE PILOT PROJECT
4. CMF4r = 1.06 + 3(SV - 0.02) =
= 1.06 + 3(0.10 - 0.10) = 1.06
5. CMF5r = 1.0 (grade < 3%)
6. CMF6r = 1.0 (less than 5 driveways / mile)
7. CMF7r = 1.0 (no rumble strips)
8. CMF8r = 1.0 (no passing lanes)
9. CMF9r = 1.0 (no TWLTL)
Note: CMF4r => super-elevation variance
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SAMPLE PILOT PROJECT
10. CMF10r =
e(-0.6869 + 0.0668 x RHR)
=
(-0.4865)
e
e(-0.6869 + 0.0668 x 2)
e(-0.4865)
= 0.94
11. CMF11r = 1.00 (no roadway lighting)
12. CMF12r = 1.00 (no automated speed enforcement)
CMFcomb = 1.11 x 1.86 x 1.06 x 0.94 = 2.06
Note: CMF10r => roadside hazard rating = 2 (based on 18’CZ
with 1:4 front slopes).
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SAMPLE PILOT PROJECT
Npredicted-rs = 0.753 x 2.06 x 1.01 = 1.57 crashes/year
Annual KABC Cost of Crashes (build conditions)
Fatal = 0.013 x 1.57 x $6,380,000 = $130,216
Incap. = 0.054 x 1.57 x $521,768 = $44,235
Nonincap. = 0.109 x 1.57 x $104,052 = $17,806
Poss. Injury = 0.145 x 1.57 x $63,510 = $14,458
ANNUAL CRASH COST (existing conditions)= $206,715
Note: crash costs from STATE SAFETY OFFICE BULLETIN 0-01 or
ROADWAY DESIGN BULLETIN 10-09
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SAMPLE PILOT PROJECT
BENEFIT/COST RATIO
Annual Reduction in Crash Costs
=
B/C =
Annual Increase in Construction Costs
314,015 – 206,715
0.08994 x 821,748
107,300
73,908
=
= 1.45: 1
Note: Construction costs were annualized at 4% over 15 years.
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DISTRICT ACTION
Submit a description of a pilot project that can be
analyzed using the current Highway Safety Manual.
Submit: narrative that describes the project
alternatives and the input values
Central Office will review the proposed analysis and
provide feedback that may include resource
information, discussion of appropriate methodology,
etc.
Submit by Wednesday, May 11th.
Information will be shared with District Champions.
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THE NEW HIGHWAY SAFETY MANUAL OF 2010
Questions?
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