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Federal Highway Research Institute
Handbook for the Evaluation
of Traffic Safety of Roads (HVS)
Rural Design Seminar,Copenhagen,
11th-12th May 2009
Roland Weber
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Formalised Instruments in Road Safety Work
211.-12. May 2009Dr.-Ing. Roland Weber
PlanningDesign
VP VE AEConstruction Operation
SafetyEstimation
SafetyEvaluation
Safety AuditPhase 1 Phase 2 Phase 3 Phase 4
Road Safety Inspection
Black Spot Management
Regular Road Patrol
Network SafetyManagement
SafetyAnalyses
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Social Viability
Environ-mental Compati-bility
Roadside Design
Traffic Safety
Traffic Flow
EconomicEfficiency
HVSHandbuch für die Bewertung
der Verkehrssicherheit von Straßen
Ausgabe 200X
311.-12. May 2009Dr.-Ing. Roland Weber
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• Planners• Safety Auditors • Members of Accident
Commissions• Scientists
Target Groups:
Basic Principles: • RAA (German Design Guidelines for Motorways)
• RAL (German Design Guidelines for Rural Roads)
• RASt (German Design Guidelines for Urban Roads)
• Current Resultsof Road Safety Research
411.-12. May 2009Dr.-Ing. Roland Weber
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Application Area of the HVS
511.-12. May 2009Dr.-Ing. Roland Weber
Safety Analyses and Safety Evaluation According to HVS
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Proof of Safety
Target: Standardised proof of safety for the evaluation of single road elements (sections, intersections) of existing as well as planned roads
Purpose: Comparison of degrees of safety of planned or existing road elements with the safety degree of guideline compliant elements=> Determination of safety potentials=> Determination / valuation of measures for
the improvement of traffic safety
611.-12. May 2009Dr.-Ing. Roland Weber
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Definition of Terms:elements = route sections and intersections
respectively parts of intersections
route section = route section with unchanging characteristics• cross section• traffic load• operational form• routing of cycle traffic
711.-12. May 2009Dr.-Ing. Roland Weber
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Elements of Motorways
811.-12. May 2009Dr.-Ing. Roland Weber
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Elements of Rural Roads
911.-12. May 2009Dr.-Ing. Roland Weber
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Elements of Urban Roads
1011.-12. May 2009Dr.-Ing. Roland Weber
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Definition of Terms:
Urban Road Section = multiple sections,possibly including subsequent intersections
Rural Road Section = multiple sections + multiple intersections
Roads = multiple road sections
1111.-12. May 2009Dr.-Ing. Roland Weber
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Basic Principles:
• basic accident cost rates for
- typical cross sections (motorway, rural road)
- typical design situations (urban road)
- types of intersections (motorway, rural road, urban road)
• impact factors of infrastructure on traffic safety
1211.-12. May 2009Dr.-Ing. Roland Weber
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Definition of Terms:SG = safety degree
(virtual figure describing the safety level)SG = gUKR + supplementsgUKR = basic accident cost rate for elements
compliant to guidelinessupplement = accident cost supplement for deviations
from guideline-compliant design/layout
1311.-12. May 2009Dr.-Ing. Roland Weber
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Definition of Terms:UKRo = accident cost rates for current inventorySGO = safety degreetoday
SGP = safety degreeplanned
UKRZ = accident cost rates for future inventory
1411.-12. May 2009Dr.-Ing. Roland Weber
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Assessment of Variants:Comparison SGP1 and SGP2
Control of Effectiveness:Comparison UKRZ and UKRO
1511.-12. May 2009Dr.-Ing. Roland Weber
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Process Steps:• determination of an evaluation case• comparison with
– guideline compliant application area– guideline compliant design/layout
• determination of supplements to accident costs• determination of safety degree
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RQ 15,5(EKL 1)
RQ 21(EKL 1,2,3)
RQ 11,5+(EKL 2)
11.-12. May 2009Dr.-Ing. Roland Weber
Evaluation Cases: Rural Road Sections
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Evaluation Cases: Rural Road Sections
RQ 9(EKL 4)
RQ 11(EKL 3)
11.-12. May 2009Dr.-Ing. Roland Weber
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Determination of Evaluation Case
1911.-12. May 2009Dr.-Ing. Roland Weber
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Basic Accident Cost Rate gUKR
2011.-12. May 2009Dr.-Ing. Roland Weber
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Definition of ‘Guideline Compliant’ • traffic load corresponds to application area• cross section components and dimensions correspond
to typical cross section• design elements of horizontal and vertical alignment
correspond to guidelines• balanced relations of consecutive radii• cross falls correspond to guidelines• existing sight distances are longer than required
stopping sight distances• roadside is free from hazards
11.-12. May 2009Dr.-Ing. Roland Weber
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Supplements for Line-Like Deviations from Guideline Compliant Elements
2211.-12. May 2009Dr.-Ing. Roland Weber
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2311.-12. May 2009Dr.-Ing. Roland Weber
Supplements for Line-Like Deviations from Guideline Compliant Elements
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2411.-12. May 2009Dr.-Ing. Roland Weber
Supplements for Punctual Deviations from Guideline Compliant Elements
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2511.-12. May 2009Dr.-Ing. Roland Weber
Supplements for Punctual Deviations from Guideline Compliant Elements
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Supplements for Line-Like Deviations UKRL,i)
2611.-12. May 2009Dr.-Ing. Roland Weber
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Supplements for Punctual Deviations UKRP,i
2711.-12. May 2009Dr.-Ing. Roland Weber
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Accident Cost Rate UKR of Elements
- Section:
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Determination of Safety Degree SG
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Evaluation Cases: Intersections on Rural Roads
11.-12. May 2009Dr.-Ing. Roland Weber
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3111.-12. May 2009Dr.-Ing. Roland Weber
Evaluation Cases: Intersections on Rural Roads
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3211.-12. May 2009Dr.-Ing. Roland Weber
Evaluation Cases: Intersections on Rural Roads
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3311.-12. May 2009Dr.-Ing. Roland Weber
Evaluation Cases: Intersections on Rural Roads
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Basic Accident Cost Rate gUKR
Bewertungsfall gUKR[EUR/1.000 Kfz]
Einmündung ohne LSA15 (Vzul 70 km/h)20 (Vzul 100 km/h)
Einmündung mit LSA 12 (Vzul 70 km/h)
Kreuzung ohne LSA30 (Vzul 70 km/h)40 (Vzul 100 km/h)
Kreuzung mit LSA 24 (Vzul 70 km/h)
Kreisverkehr 10
Einfahrbereich 5
Ausfahrbereich 5
3411.-12. May 2009Dr.-Ing. Roland Weber
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Basic accident cost rate
gUKR: 24 EUR/1.000 Kfz for Vzul = 70 km/h
Guideline compliant element:• left-turn lane provided• lane separation in the subordinate intersection approaches• single-lane subordinate intersection approaches• required visibility fields are kept unobstructed• left-turning traffic signalised conflict-free• bicycle traffic is to use separate pedestrian/cycle paths• bicycle traffic is not given right of way at crossings
3511.-12. May 2009Dr.-Ing. Roland Weber
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Tab. 29: Zuschläge für zufahrtspezifische Abweichungen UKRZ,i – Plangleiche Knotenpunkte und plangleiche Teilknotenpunkte an Landstraßen
Tab. 28: Zuschläge für knotenpunktspezifische Abweichungen UKRK, i – Plangleiche Knotenpunkte und plangleiche Teilknotenpunkte an Landstraßen
Example: Signalised Intersection according to RAL
3611.-12. May 2009Dr.-Ing. Roland Weber
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Supplements for Intersection Specific Deviations UKRK,i- rural : one supplement per deviation / intersection - urban : one supplement per deviation / access
3711.-12. May 2009Dr.-Ing. Roland Weber
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Accident Cost Rate UKR of an Element
- Intersection:
3811.-12. May 2009Dr.-Ing. Roland Weber
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Determination of Safety Degree SG
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Evaluation Cases : Typical Cross Sections RAA (EKA 1)
RQ 43,5
RQ 36
RQ 31
11.-12. May 2009Dr.-Ing. Roland Weber
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Evaluation Cases : Typical Cross Sections RAA (EKA 2/3)
RQ 28
RQ 26
RQ 31,5
11.-12. May 2009Dr.-Ing. Roland Weber
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Determination of Evaluation Case
4211.-12. May 2009Dr.-Ing. Roland Weber
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4311.-12. May 2009Dr.-Ing. Roland Weber
Basic Accident Cost Rate gUKR
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Evaluation Cases: Cross Sections RASt
typical design situation:• district road• village main street• local approach road• local shopping street• high street• commercial road• industrial road• linking road
11.-12. May 2009Dr.-Ing. Roland Weber
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Evaluation Cases: Cross Sections RASt
typical design situation:• access-free road
typical design situation:• commercial road• industrial road• linking road
11.-12. May 2009Dr.-Ing. Roland Weber
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Evaluation Cases: Cross Sections RASttypical design situation:• local shopping street• high street
typical design situation:• local shopping street• high street• industrial road• linking road• access-free road
11.-12. May 2009Dr.-Ing. Roland Weber
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Evaluation Cases: Cross Sections RASt
typical design situation:• local shopping street• high street• linking road
11.-12. May 2009Dr.-Ing. Roland Weber
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Evaluation Cases: Cross Sections RASt
typical design situation:• local shopping street• high street• linking road• access-free road
typical design situation:• local shopping road• linking road
11.-12. May 2009Dr.-Ing. Roland Weber
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Basic Accident Cost Rate gUKRCarriageway cross section Basic accident cost rate
[EUR/(1.000 Kfz km)]
2-lanes without physical separation of directions 10
2-lanes without physical separation of directionswith rail tracks in the carriageway 40
2-lanes with physical separation of directions 6
2-lanes with special rail tracksas physical separation of directions 20
4-lanes without physical separation of directions 20
4-lanes with physical separation of directions 10
4-lanes with special rail tracksas physical separation of directions 20
4911.-12. May 2009Dr.-Ing. Roland Weber
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Local approach road
basic accident cost rate
gUKR: 10 EUR/(1.000 Kfz ● km)
Charakteristics (according to RASt):• main traffic road (HS IV, HS III)• closed respectively semi-open construction• mixed usage (commerce, residential, hardly any shops)• great variety of road widths• section lengths of 200 to 800 m• traffic volume 400 to1800 Kfz/h• as a rule public bus transport
5011.-12. May 2009Dr.-Ing. Roland Weber
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Marginal conditions:• safe routing of cycle traffic for both directions• adherence to speed limit is ensured
Local approach road
Basic accident cost rate
gUKR: 10 EUR/(1.000 Kfz ● km)
5111.-12. May 2009Dr.-Ing. Roland Weber
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Supplements are derived from the absence and the unsafe execution of guideline-compliant design elements as per the following tables:Tab. 35: Width of Pavement (Sidewalk)Tab. 36: Crossing AidsTab. 37: Traffic Islands and MediansTab. 38: Kerb extensionsTab. 39: Pedestrian Signals
Tab. 40: Pedestrian Crossings
Tab. 41: One-Way Cycle LaneTab. 42: Two-Way Cycle LaneTab. 43: Cycle Protection LaneTab. 45: Mixed TrafficTab. 50: Parking and Loading in Special Lanes
or in BaysTab. 52: Two-Lane Carriageways
Local approach road
Basic accident cost rate
gUKR: 10 EUR/(1.000 Kfz ● km)
5211.-12. May 2009Dr.-Ing. Roland Weber
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Example Urban Road Route Section
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54
Evaluation Cases: Intersections RASt
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55
Evaluation Cases: Intersections RASt
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Intersection 1Intersection 2
Section 1
Section 2
56
Example – Safety Evaluation
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Intersection 1Intersection 2
Section 1
Section 2
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Example – Safety Evaluation
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Example – Safety Evaluation
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Kriterium Abweichungen vom richtliniengerechten AusbauUKRL,i
[EUR/(1.000 Kfz ● km )]RQ 21 RQ 15,5 RQ
11,5+ RQ 11 RQ 9Verkehrsbelastung • DTV > 30.000 Kfz/24h, wenn kein Seitenstreifen 2
• DTV > 20.000 Kfz/24h 2
• DTV > 17.000 Kfz/24h 2
• DTV > 15.000 Kfz/24h 2
• DTV > 3.000 Kfz/24h 4
• DTV-SV > 150 Fz./24h 6Betriebsform • Straße für den allgemeinen Verkehr,
Verbot des Radverkehrs auf der Fahrbahn 2
• Straße für den allgemeinen Verkehr, Radverkehrauf einem gesonderten Geh- und Radweg 2 2
• Straße für den allgemeinen Verkehr, Radverkehr auf der Fahrbahn 10 6 6 2
Querschnitt• Fahrbahnbreite zwischen 7,00 m und 7,75 m 1
• Fahrbahnbreite unter 7,00 m 3
• Fahrstreifenbreite bei einstreifiger Verkehrsführung3,25 m ≤ B < 3,50 m Radverkehr auf der Fahrbahn 1 1 1
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Evaluation Case gUKR[EUR/1.000 Kfz]
uncontrolled T-junction15 (Vzul 70 km/h)
20 (Vzul 100 km/h)
signal controlled T-junction 12 (Vzul 70 km/h)
uncontrolled intersection30 (Vzul 70 km/h)
40 (Vzul 100 km/h)
signal controlled intersection 24 (Vzul 70 km/h)
roundabout 10
entrance area 5
exit area 5
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Kriterium Abweichungen vom richtliniengerechten Ausbau
UKRK,i[EUR/(1.000 Kfz)]
Einmündungohne LSA
Einmündungmit LSA
Kreuzungohne LSA
Kreuzungmit LSA
Kreis-verkehr
Verkehrsbelastung • DTV > 5.000 Kfz/24h 5 5
Querschnitt• Breite der durchgehenden Fahrstreifen im
Vergleich zur freien Strecke um > 0,25 m reduziert
1 1 1 1
Knotenpunktlage
• Winkel der zu verknüpfenden Straßenα < 80 gon bzw. α > 120 gon 2 2 2 2
• Knotenpunkt in einer engen Kurve 4 4 4 4 4
• Knotenpunkt im Bereich einer Kuppe 6 6 6 6 2
• Längsneigung in der(den) übergeordneten Knotenpunktzufahrt(en) s > 4,0 % 1 1 1 1 1
Knotenpunktgestalt • Hindernis auf der Kreisinsel 4
Knotenpunkt-elemente
• Kreisfahrbahn zweistreifig befahrbar 1
• Kreisfahrbahn zweistreifig markiert 3
LSA • Abschaltung der LSA zu verkehrsschwachen Zeiten 6 6
Radverkehr • Radverkehr auf der Fahrbahn 2 2 2 2 2
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UKRSection[EUR / 1.000 Kfz ● km]
UKRIntersection[EUR / 1.000 Kfz]
Variant 1
Section 1 28 + ∆
Section 2 28+ ∆
Intersection 1 12 + ∆
Intersection 2 24 + ∆
Variant 2
Section 1 34+ ∆
Section 2 34+ ∆
Intersection 1 10+ ∆
Intersection 2 24+ ∆
Determination of Accident Cost Rates andSafety Evaluation Based on Planning Deficits
SafetyEvaluation
B
C
A
B
D
D
A
B
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At this point of development it must be born in mind that the mentioned gUKR are of different origin and thus not compatible (yet):
gUKR for urban roads were derived from current accident analyses from different towns, they constitute the percentile-value (30 %) of the total distribution of the UKR of all roads
gUKR for motorways and rural roads were derived fromRAS-Q96, they constitute average values
„Degree of Maturity“ of the HVS:
Further Procedure:Up-dating gUKR for motorways and rural roads based on current research projects
Validation of particularly cost rates for differentiated supplements using inventory and design examples
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Ausgabe 20
HVSHandbuch für die
Bewertung der Verkehrssicherheit von
Straßen
Ausgabe 20xx
Thank you for your attention!
6511.-12. May 2009Dr.-Ing. Roland Weber