Cadei - input2012

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Margherita Cadei on "The Urban Road Safety Plan (PSSU): the case study of Brescia"

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Cadei - input2012

  1. 1. Cagliari, 10-12 maggio 2012 The Urban Road Safety Plan(PSSU): the case study of Brescia Eng. Margherita CADEIPhD student in “Places and times of the city and territories” University of Brescia Faculty of Engineering - DICATA margherita.cadei@ing.unibs.it
  2. 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. 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. 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. 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 tINPUT 2012 – Cagliari 10-12 may 2012 Eng. Margherita Cadei – University of Brescia
  6. 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. 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 promotedINPUT 2012 – Cagliari 10-12 may 2012 Eng. Margherita Cadei – University of Brescia
  8. 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. 9. Cagliari, 10-12 maggio 2012 :: Thank you for your attention ::The Urban Road Safety Plan (PSSU): the case study of Brescia Eng. Margherita CADEIPhD 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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