road network safety management

1

Professor P. Colonna presented the paper titled «Road Network

Safety Management» during the conference «Summer School SIIV

2012, Theoretical principles and practical application in the

framework of the European Directive 2008/96/CE» held on 24-28

September 2012 in Catania, Italy through the following slides.

Il Prof. P. Colonna ha presentato la pubblicazione «Road Network

Safety Management» durante la conferenza «Summer School SIIV

2012, Theoretical principles and practical application in the

framework of the European Directive 2008/96/CE» tenuta nei giorni

24-28 Settembre 2012 a Catania attraverso l’esposizione delle

seguenti slide.

RNSF – PA and Research Needs – P. Colonna

SUMMER SCHOOL SIIV 2012 Road Safety Management

Road Network Safety Management

Practical Application and Research Needs

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SUMMER SCHOOL SIIV 2012 - ROAD SAFETY MANAGEMENT Theoretical principles and practical application in the framework of the European Directive 2008/96/CE

Catania 24-28 September 2012

Polytechnic University of Bari DICATECh prof. Pasquale Colonna


These working hypotheses are correct?

In particular:

upgrading of road infrastructure project:

• significantly increases the level of road safety?

• represents the priority actions to be implemented for road safety?

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Working Hypothesis of the Directive


Critical Considerations

• In this thriller we must seek the guilty, the murderess. Where the clues lead us? towards the control systems and user behavior

• But in the case of the roads to reduce accident rates where we focus? On the Design of the Route! >>> Is it reasonable?

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Margins of decision of different transport systems Mode Accident Rate

Design of the Route

Control Systems

User Behavior

xxxxxx xx xx Railroad xxx

xxxxxxxxx xx xx Airway x

xxxxxxxx xxxxxxxxx xxxxxxxxxx Road xxxxxxxxxxxxxxx


Critical Considerations • Importance of Control Systems

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• User Behavior

The increased risk of road system is due to the different behavior (degrees of freedom) of the different users.

The possible degrees of freedom are the speed and the position in the cross section

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• User Behavior

The Behavior of Non-Habitual User can be very different from that of Habitual User

The behavior characteristics of Non-Habitual User are quite independent of the type of risk

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• User Behavior

External risk: risk not known by the driver or not foreseeable in the specific circumstances of time and place. The other risks are defined Internal Risks.

The Behavior is different if the User encounters an External or Internal Risk

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• User Behavior

But when the Behavior Compensation is impossible?

Certainly only if the driver doesn’t knows the risk or is not able to predict it and therefore only if the Risk is an External Risks.

Instead the behavior compensation can occur if the risk is an Internal Risk.

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• User Behavior

the countermeasure is effective if

a) it does not internalize the risk

or

b) it internalizes the risk without inducing compensation at the level of speed and trajectory

Further clues (round table on Friday)

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• User Behavior

Really the possible degrees of freedom are the speed and the position in the cross section?

Really the Behavior of Non-Habitual User can be very different from that of Habitual User?

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A group of users has been subjected by Polytechnic

University of Bari to a driving test of a circuit of known

geometry on board of a vehicle instrumented with

high precision GPS.

Were processed data relating to speed and trajectory.

Were analyzed the data of drivers as a function of the

geometry and the number of laps already paths.


RETTIFILO 1 : Larghezza 19,5 metri START

RETTIFILO 2 : Larghezza 8 metri

Canaletta prefabbricata semicircolare Ø 50 cm

R = 25.00 m

8.10 m

R. int. = 27.60 m 12.00 m

R=

19.5

0 m

30°

120°

30°

19.07 m

95.86 m

19.07 m

134.00 m

19.5

0 m

19.5

0 m

31.0

0 m

8.00

m

R = 19.50 m

R =

27.60 m

12.00 m

8.00 m

30°

120°

30°

Asse simmetria pista

- 0.60

- 0.90

- 1.00

- 0.82

- 0.72

- 0.60

- 0.60

- 0.90

- 1.00

- 0.82

- 0.72

- 0.60

- 0.50

- 0.90

8.00

m

- 1.00

- 0.60

Canaletta prefabbricata

semicircolare Ø 50cm

I

IG

GE

E

C

C

A

A

A

A

C

C

E

E

G

G

I

I

Descrizione generale - il circuito


Descrizione generale - il circuito

Canaletta prefabbricata semicircolare Ø 50 cm

R = 25.00 m

8.10 m

R. int. = 27.60 m 12.00 m

R=

19.5

0 m

30°

120°

30°

19.07 m

95.86 m

19.07 m

134.00 m

19.5

0 m

19.5

0 m

31.0

0 m

8.00

m

R = 19.50 m

R =

27.60 m

12.00 m

8.00 m

30°

120°

30°

Asse simmetria pista

- 0.60

- 0.90

- 1.00

- 0.82

- 0.72

- 0.60

- 0.60

- 0.90

- 1.00

- 0.82

- 0.72

- 0.60

- 0.50

- 0.90

8.00

m

- 1.00

- 0.60

Canaletta prefabbricata

semicircolare Ø 50cm

I

IG

GE

E

C

C

A

A

A

A

C

C

E

E

G

G

I

I



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In general the speed of the drivers is increased

with the number of laps completed.



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In general the variance of the speed of the drivers

is increased with the number of laps completed.


The average displacement of the trajectories depends on the speed: there is a particular value of the speed for which the displacement is minimal (optimum of feeling).

R² = 0,8238

0,0300

0,0350

0,0400

0,0450

0,0500

0,0550

0,0600

0,0650

0,0700

0,0750

0,0800

]10 ; 15] ]15 ; 20] ]20 ; 25] ]25 ; 30] ]30 ; 35] ]35 ; 40] ]40 ; 45] ]45 ; 50] ]50 ; 55] ]55 ; 60]

Km/h

R1

AGGRESSIVENESS


LESS CONCENTRATION


For lower speeds (distracted user) the displacement is smaller and for higher speeds (aggressives user) the speed is higher.

R² = 0,8238

0,0300

0,0350

0,0400

0,0450

0,0500

0,0550

0,0600

0,0650

0,0700

0,0750

0,0800

]10 ; 15] ]15 ; 20] ]20 ; 25] ]25 ; 30] ]30 ; 35] ]35 ; 40] ]40 ; 45] ]45 ; 50] ]50 ; 55] ]55 ; 60]

Km/h

R1

LESS CONCENTRATION AGGRESSIVENESS




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Type of Risk Component Countermeasures Behavior Compensation

Probability Engineering on Board

External Safety Tools on Passengers No

Intensity on Road

Medical Efficiency

Probability

Internal Yes

Intensity


A possible new interpretation on WHY road accidents happen

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Thank you very much to all partecipant to Catania 2012 SIIV Summer School for stimulating exchange of ideas

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road network safety management

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