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Cagliari, 10-12 maggio 2012




  The Urban Road Safety Plan
(PSSU): the case study of Brescia
                  Eng. Margherita CADEI
PhD student in “Places and times of the city and territories”
                   University of Brescia
              Faculty of Engineering - DICATA


                  margherita.cadei@ing.unibs.it
INTRODUCTION

  Urban Road Safety Plan (Piano Della Sicurezza Stradale Urbana – PSSU) has been
  introduced in Italy in 2001
  (Ministry of the Public Works Circular n.3698 “Piani della sicurezza stradale urbana –
  Linee guida per la redazione”, Rome, June 8th 2001)
  BRESCIA (Middle-sized city; population: about 200.000 people; surface: about 90
  km2)
                                           First PSSU elaborated in 2009

                                           PSSU: a planning tool to manage road
                                           safety at local level (urban areas) in an
                                           organic and systemic way.
                                           Based on road accident data analysis, it is
                                           able to detect the road accident problems
                                           on the urban road network and to offer
                                           objective criteria to make choices.

                                           Before: decisions about road safety based
                                           on extemporary choices or warnings coming
                                           from the population.


INPUT 2012 – Cagliari 10-12 may 2012                       Eng. Margherita Cadei – University of Brescia
A PSSU’s main document (Piano Direttore) contains:

  - aggregate analysis of the road accident data;
  - detection of the network “Black spots”;
  - definition of quantitative objectives and list of actions/strategies to be implemented;
  - quantification of costs/benefits;
  - definition of the monitoring process and coordination of the plan.

  One of the most important purpose of a PSSU consists in making lists of critic
  sites where infrastructural interventions are more urgent (“Black spots”).

  It’s important to use adequate indicators to express the level of risk of the
  network segments.




INPUT 2012 – Cagliari 10-12 may 2012                         Eng. Margherita Cadei – University of Brescia
A PSSU’s main document (Piano Direttore) contains:

  - aggregate analysis of the road accident data;
  - detection of the network “Black spots”;
  - definition of quantitative objectives and list of actions/strategies to be implemented;
  - quantification of costs/benefits;
  - definition of the monitoring process and coordination of the plan.

  One of the most important purpose of a PSSU consists in making lists of critic
  sites where infrastructural interventions are more urgent (“Black spots”).

  It’s important to use adequate indicators to express the level of risk of the
  network segments.




INPUT 2012 – Cagliari 10-12 may 2012                         Eng. Margherita Cadei – University of Brescia
A PSSU’s main document (Piano Direttore) contains:

  - aggregate analysis of the road accident data;
  - detection of the network “Black spots”;
  - definition of quantitative objectives and list of actions/strategies to be implemented;
  - quantification of costs/benefits;
  - definition of the monitoring process and coordination of the plan.

  One of the most important purpose of a PSSU consists in making lists of critic
  sites where infrastructural interventions are more urgent (“Black spots”).

  It’s important to use adequate indicators to express the level of risk of the
  network segments.

        In Brescia: ROAD ACCIDENT RATE (for each “homogeneous road segment i”):

                                                  10 6 ⋅ N i
                                       Ti =
                                            365 ⋅ l i ⋅ ∑ TGM   i,t
                                                     t
INPUT 2012 – Cagliari 10-12 may 2012                                  Eng. Margherita Cadei – University of Brescia
Instead of calculating the road accident rate for road segments belonging to single
  itineraries and instead of comparing the segments’ rate with two threshold values
  (CNR,1998) in Brescia each road segment rate is compared with the average
  value calculated for the road functional class to which the road segment belongs
  (Maternini, 2000).




        Id   Road segment              Ti
                                              This indicator is able to express the risk related to
        21   VIA MILANO                2,71
                                              road safety: it puts into relation the number of
        44   VIA CROCIFISSA            2,38
                                              accidents, the road segment length and the amount
        35   VIA ZIMA                  2,34   of traffic.
        50   P.LE SPEDALI              2,32
        13   VIA CHIUSURE              2,30   FAULTY ASPECT: Inaccuracy inherently contained
        49   VIA DAL MONTE             2,26
                                              in the Istat road accident data (Tiboni, 2004)
        20   VIA MILANO                2,23   The exact localization is not always possible;
        40   V.LE PIAVE                1,94
        …    …                         …      Uniform distribution of the incomplete data!
INPUT 2012 – Cagliari 10-12 may 2012                                   Eng. Margherita Cadei – University of Brescia
SOME CRITICALITIES ABOUT THE ELABORATION OF THE PSSU:

  ENDOGENIC FACTORS                                              EXTERNAL FACTORS
   - quality of the Istat road accident data:   - PSSU is just a “mandatory task”: it
        - imprecise mapping introduces a        is elaborated but not actually
        systemic error in the road accident     implemented;
        rate calculation;
        - late delivery of the Istat data       - lack of a strong policy towards the
        makes unfeasible the monitoring of      road safety issues:
        the actions (PSSU life time spans 2          - inadequate resources
        years)                                       assignment for the
        - disaggregate analysis                      implementation plans;
        methodologies based on road                  - scarce coordination among
        accident scenarios/collisions                the technical departments in
        diagrams cannot be easily applied            delivering the road safety
                                                     projects/plan updating
   - the Ministry Guidelines are, in some
   parts, vague/incomplete:
        - cost/benefit analysis;
        - the “participated plan process” is
        not sufficiently promoted

INPUT 2012 – Cagliari 10-12 may 2012                     Eng. Margherita Cadei – University of Brescia
SOME CONCLUSIONS


   There are still some aspects that makes road safety planning/implementation
   difficult;

   it is hoped a wider application of the good practices available in
   literature/resarches in this field;

   it is hoped a review/enhancement of the present Ministry guidelines;

   a stronger integration between the road safety and the already existing
   urban/mobility planning tools should be promoted.




INPUT 2012 – Cagliari 10-12 may 2012                         Eng. Margherita Cadei – University of Brescia
Cagliari, 10-12 maggio 2012



              :: Thank you for your attention ::



The Urban Road Safety Plan (PSSU):
     the case study of Brescia
                  Eng. Margherita CADEI
PhD student in “Places and times of the city and territories”
                   University of Brescia
              Faculty of Engineering - DICATA
                  margherita.cadei@ing.unibs.it

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Cadei - input2012

  • 1. Cagliari, 10-12 maggio 2012 The Urban Road Safety Plan (PSSU): the case study of Brescia Eng. Margherita CADEI PhD student in “Places and times of the city and territories” University of Brescia Faculty of Engineering - DICATA margherita.cadei@ing.unibs.it
  • 2. INTRODUCTION Urban Road Safety Plan (Piano Della Sicurezza Stradale Urbana – PSSU) has been introduced in Italy in 2001 (Ministry of the Public Works Circular n.3698 “Piani della sicurezza stradale urbana – Linee guida per la redazione”, Rome, June 8th 2001) BRESCIA (Middle-sized city; population: about 200.000 people; surface: about 90 km2) First PSSU elaborated in 2009 PSSU: a planning tool to manage road safety at local level (urban areas) in an organic and systemic way. Based on road accident data analysis, it is able to detect the road accident problems on the urban road network and to offer objective criteria to make choices. Before: decisions about road safety based on extemporary choices or warnings coming from the population. INPUT 2012 – Cagliari 10-12 may 2012 Eng. Margherita Cadei – University of Brescia
  • 3. A PSSU’s main document (Piano Direttore) contains: - aggregate analysis of the road accident data; - detection of the network “Black spots”; - definition of quantitative objectives and list of actions/strategies to be implemented; - quantification of costs/benefits; - definition of the monitoring process and coordination of the plan. One of the most important purpose of a PSSU consists in making lists of critic sites where infrastructural interventions are more urgent (“Black spots”). It’s important to use adequate indicators to express the level of risk of the network segments. INPUT 2012 – Cagliari 10-12 may 2012 Eng. Margherita Cadei – University of Brescia
  • 4. A PSSU’s main document (Piano Direttore) contains: - aggregate analysis of the road accident data; - detection of the network “Black spots”; - definition of quantitative objectives and list of actions/strategies to be implemented; - quantification of costs/benefits; - definition of the monitoring process and coordination of the plan. One of the most important purpose of a PSSU consists in making lists of critic sites where infrastructural interventions are more urgent (“Black spots”). It’s important to use adequate indicators to express the level of risk of the network segments. INPUT 2012 – Cagliari 10-12 may 2012 Eng. Margherita Cadei – University of Brescia
  • 5. A PSSU’s main document (Piano Direttore) contains: - aggregate analysis of the road accident data; - detection of the network “Black spots”; - definition of quantitative objectives and list of actions/strategies to be implemented; - quantification of costs/benefits; - definition of the monitoring process and coordination of the plan. One of the most important purpose of a PSSU consists in making lists of critic sites where infrastructural interventions are more urgent (“Black spots”). It’s important to use adequate indicators to express the level of risk of the network segments. In Brescia: ROAD ACCIDENT RATE (for each “homogeneous road segment i”): 10 6 ⋅ N i Ti = 365 ⋅ l i ⋅ ∑ TGM i,t t INPUT 2012 – Cagliari 10-12 may 2012 Eng. Margherita Cadei – University of Brescia
  • 6. Instead of calculating the road accident rate for road segments belonging to single itineraries and instead of comparing the segments’ rate with two threshold values (CNR,1998) in Brescia each road segment rate is compared with the average value calculated for the road functional class to which the road segment belongs (Maternini, 2000). Id Road segment Ti This indicator is able to express the risk related to 21 VIA MILANO 2,71 road safety: it puts into relation the number of 44 VIA CROCIFISSA 2,38 accidents, the road segment length and the amount 35 VIA ZIMA 2,34 of traffic. 50 P.LE SPEDALI 2,32 13 VIA CHIUSURE 2,30 FAULTY ASPECT: Inaccuracy inherently contained 49 VIA DAL MONTE 2,26 in the Istat road accident data (Tiboni, 2004) 20 VIA MILANO 2,23 The exact localization is not always possible; 40 V.LE PIAVE 1,94 … … … Uniform distribution of the incomplete data! INPUT 2012 – Cagliari 10-12 may 2012 Eng. Margherita Cadei – University of Brescia
  • 7. SOME CRITICALITIES ABOUT THE ELABORATION OF THE PSSU: ENDOGENIC FACTORS EXTERNAL FACTORS - quality of the Istat road accident data: - PSSU is just a “mandatory task”: it - imprecise mapping introduces a is elaborated but not actually systemic error in the road accident implemented; rate calculation; - late delivery of the Istat data - lack of a strong policy towards the makes unfeasible the monitoring of road safety issues: the actions (PSSU life time spans 2 - inadequate resources years) assignment for the - disaggregate analysis implementation plans; methodologies based on road - scarce coordination among accident scenarios/collisions the technical departments in diagrams cannot be easily applied delivering the road safety projects/plan updating - the Ministry Guidelines are, in some parts, vague/incomplete: - cost/benefit analysis; - the “participated plan process” is not sufficiently promoted INPUT 2012 – Cagliari 10-12 may 2012 Eng. Margherita Cadei – University of Brescia
  • 8. SOME CONCLUSIONS There are still some aspects that makes road safety planning/implementation difficult; it is hoped a wider application of the good practices available in literature/resarches in this field; it is hoped a review/enhancement of the present Ministry guidelines; a stronger integration between the road safety and the already existing urban/mobility planning tools should be promoted. INPUT 2012 – Cagliari 10-12 may 2012 Eng. Margherita Cadei – University of Brescia
  • 9. Cagliari, 10-12 maggio 2012 :: Thank you for your attention :: The Urban Road Safety Plan (PSSU): the case study of Brescia Eng. Margherita CADEI PhD student in “Places and times of the city and territories” University of Brescia Faculty of Engineering - DICATA margherita.cadei@ing.unibs.it