district pilot project presentation may 2, 2011 1 highway safety manual implementation
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DISTRICT PILOT PROJECT PRESENTATIONMAY 2, 2011
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Highway Safety Manual Implementation
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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Highway Safety Manual Implementation
Presentation Outline
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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
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Submit District Champion counterparts from Transportation Development and Operations to Marianne Trussell, Chief Safety Officer by April 29, 2011.
CALIBRATION OF THE HIGHWAY SAFETY MANUAL TO FLORIDA CONDITIONS
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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
sites all
sites all
crashes predicted
crashes observedC
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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
KAB1.352 1.375 1.244 1.220
1.363 1.235
KABC1.063 1.071 1.027 0.982
1.067 1.007
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RURAL MULTILANE DIVIDED ROADS
N = exp[ a + b × ln(AADT) + ln(L) ]
CMFs with available data Lane width, right shoulder width, median
width, lighting CMFs with values assumed
None
Crash Severity Level a b
4-lane fatal and injury (KAB) -8.837 0.958
4-lane fatal and injury (KABC) -8.505 0.874
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RURAL MULTILANE DIVIDED ROADS
Rural 4 Lane Divided Calibration Factor
2005 2006 2007 2008
KAB0.777 0.760 0.746 0.695
0.768 0.721
KABC0.724 0.703 0.708 0.671
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
KABC
1.103 1.009 1.139 0.947
1.057 1.044
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URBAN 2 LANE WITH TWLTL
Urban 2 Lane with TWLTL Calibration Factor
2005 2006 2007 2008
KABC
0.916 1.184 1.105 1.073
1.051 1.089
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URBAN 4 LANE DIVIDED ARTERIALS
Urban 4 Lane Divided Calibration Factor
2005 2006 2007 2008
KABC
1.758 1.637 1.681 1.609
1.697 1.646
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URBAN 4 LANE UNDIVIDED
Urban 4 Lane Undivided Calibration Factor
2005 2006 2007 2008
KABC
0.627 0.743 0.777 0.697
0.685 0.738
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URBAN 4 LANE WITH TWLTL
Urban 4 Lane with TWLTL Calibration Factor
2005 2006 2007 2008
KABC
0.749 0.765 0.735 0.708
0.744 0.698
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BIKE LANES – URBAN 4 LANE DIVIDED Without bike lane separation
With bike lanes
Without bike lanes
2007-2008 CALIBRATION SUMMARY
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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-on-red, 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 miles2. 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: 26. Lane width: 12’7. Shoulder width: 4’8. Shoulder type: paved9. Roadside hazard rating: 2 (based on 18’ CZ with 1:4 front slopes)10. Curve length: 0.06 miles11. Existing e: 3.5% (eastbound) and 0.0% (westbound)12. Required e: 10.0%13. Calibration factor: 1.01
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 =
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SAMPLE PILOT PROJECT
(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)==
Note: CMF1r => lane width; CMF2r => shoulder width and type; CMF3r => horizontal curvature
2.51
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)
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SAMPLE PILOT PROJECT
Note: CMF4r => super-elevation variance
10. CMF10r =
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SAMPLE PILOT PROJECTe(-0.6869 + 0.0668 x RHR)
e(-0.4865)=
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).
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
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SAMPLE PILOT PROJECT
Note: crash costs from STATE SAFETY OFFICE BULLETIN 0-01 or ROADWAY DESIGN BULLETIN 10-09
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 =
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SAMPLE PILOT PROJECT
(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)==
Note: CMF1r => lane width; CMF2r => shoulder width and type; CMF3r => horizontal curvature
1.86
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)
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SAMPLE PILOT PROJECT
Note: CMF4r => super-elevation variance
10. CMF10r =
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SAMPLE PILOT PROJECTe(-0.6869 + 0.0668 x RHR)
e(-0.4865)=
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).
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
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SAMPLE PILOT PROJECT
Note: crash costs from STATE SAFETY OFFICE BULLETIN 0-01 or ROADWAY DESIGN BULLETIN 10-09
BENEFIT/COST RATIO
B/C =
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SAMPLE PILOT PROJECT
Annual Reduction in Crash Costs
Annual Increase in Construction Costs=
314,015 – 206,715 =
Note: Construction costs were annualized at 4% over 15 years.
0.08994 x 821,748
=73,908
107,3001.45: 1
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.40
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THE NEW HIGHWAY SAFETY MANUAL OF 2010
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