1 I MPROVING ROAD SAFETY AND OPERATIONS OF URBAN ARTERIALS: The study-case of Viale Ariosto in Sesto...

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  • IMPROVING ROAD SAFETY AND OPERATIONS OF URBAN ARTERIALS:The study-case of Viale Ariosto in Sesto Fiorentino, Florence (Italy) Antonio PratelliDepartment of Civil Engineering Vie e Trasporti University of Pisa (Italy) CE552 Highway Safety Meeting7th April 2009

  • Tuscany (Central Italy)Lectures at the IOWA STATE UNIVERSITY April 2009

  • Sesto Fiorentino (Florence Belt)Lectures at the IOWA STATE UNIVERSITY April 2009

  • Urban street: Park AvenueLength: 1700 mt (1,06 miles)Main intersections: 5 (2 roundabouts + 3 signals)Traffic: 1900-2100 vph (AM peak flow rates)Passing trough vehicles (Master Plan forecasts): 67%VIALE ARIOSTOLectures at the IOWA STATE UNIVERSITY April 2009

  • Reducing traffic congestion4 MAIN GOALS Traffic negative impacts mitigation (pollutions, noise, delays and queues)

    Enhancing and improving roadway environment and urban landscape Increasing road safety for all road users (vehicles + pedestrians + bicyclists)Lectures at the IOWA STATE UNIVERSITY April 2009

  • Construction divided into two different lots (due to both functional and economic matters): Lot 1) from Via Querciola to Via Rimaggio (950 m); Lot 2) from Via Pavese to Via Neruda (750 m).

    THE ARIOSTO PROJECT System approach design: the project has been extended to the arterial in its whole. We show some interesting design items, such as: - Querciola and Pavese (roundabout functional improvement); - Gavine and Oca Bianca (traffic calming device); - Neruda (conversion from signal to roundabout);Lectures at the IOWA STATE UNIVERSITY April 2009

  • THE ARIOSTOPROJECT (2) We show some interesting design items, such as: Querciola and Pavese (roundabout functional improvement); Gavine and Oca Bianca (traffic calming devices); Neruda (conversion from signal to roundabout).Lectures at the IOWA STATE UNIVERSITY April 2009

  • VIA QUERCIOLALectures at the IOWA STATE UNIVERSITY April 2009

  • VIA QUERCIOLADESIGN CATEGORY:Improving the present roundabout via geometrical corrections related to the European standards.

    NEW GEOMETRY FEATURES:Lectures at the IOWA STATE UNIVERSITY April 2009

  • VIA QUERCIOLA (before)Lectures at the IOWA STATE UNIVERSITY April 2009

  • VIA QUERCIOLA (after)Lectures at the IOWA STATE UNIVERSITY April 2009

  • VIA QUERCIOLA (superimposed)Lectures at the IOWA STATE UNIVERSITY April 2009WHITE = actualRED = design

  • VIA QUERCIOLA

    EXPECTED RESULTS* (AM peak scenario):

    (*) Values obtained by SETRA model for large roundabouts.Lectures at the IOWA STATE UNIVERSITY April 2009

  • VIA QUERCIOLA (3D simulation)

    Lectures at the IOWA STATE UNIVERSITY April 2009

  • VIA QUERCIOLA (yesterday)

    Lectures at the IOWA STATE UNIVERSITY April 2009

  • VIA QUERCIOLA (today)

    Lectures at the IOWA STATE UNIVERSITY April 2009

  • GAVINE & OCA BIANCALectures at the IOWA STATE UNIVERSITY April 2009

  • GAVINEDESIGN CATEGORY:Traffic calming features obtained by insertion of a median traffic island to carry out: 1) safe island for pedestrians crossing the road; 2) left turns elimination; 3) make a severe obstacle to bikers overpassing the bus where the bus stop is placed.Lectures at the IOWA STATE UNIVERSITY April 2009

  • GAVINEEXPECTED RESULTS:Accidents reduction due to:Suppression of all the left turn conflict points.Better protection offered to pedestrians at the zebra-crossing.Impeding dangerous overpasses, especially for mopeds and bikes, of the bus stopped at the bus stop.Global increase of road safety (with low costs).Lectures at the IOWA STATE UNIVERSITY April 2009

  • Lectures at the IOWA STATE UNIVERSITY April 2009GAVINE (today)

  • Lectures at the IOWA STATE UNIVERSITY April 2009Oca Bianca - GiardiniDESIGN CATEGORY:Removal of the pedestrian actuated signal (due to the actual poor pedestrians rate of flows).

    Insertion of a new median traffic island to carry out: safe island for pedestrians crossing the road;left turns conflicts elimination; make a severe obstacle to bikers overpassing the bus where the bus stop is placed.

  • Lectures at the IOWA STATE UNIVERSITY April 2009Oca Bianca - GiardiniPrevious layoutDesign layout

  • Lectures at the IOWA STATE UNIVERSITY April 2009Oca Bianca - GiardiniVia LazzeriniVia CorsinuoviViale Ariosto

  • VIA PAVESELectures at the IOWA STATE UNIVERSITY April 2009

  • Lectures at the IOWA STATE UNIVERSITY April 2009VIA PAVESEDESIGN CATEGORY:Improving the present roundabout via geometrical corrections related to the European standards.

    NEW GEOMETRY FEATURES:

    beforeafterInscribed circle diameter (no shoulders)62,50 m53,50 mGrassy central island radius23,00 m13,60 mCirculatory roadway width7,5 m10,50 mApron width---2,00 mNumber of circulatory lanes12Number of entry lanes 1 per entry 2 per entry

  • Lectures at the IOWA STATE UNIVERSITY April 2009Via PaveseVia OsmannoroViale AriostoViale AriostoAerial view of the situation before works.

  • Lectures at the IOWA STATE UNIVERSITY April 2009VIA PAVESE (design layout)

  • Lectures at the IOWA STATE UNIVERSITY April 2009VIA PAVESE (superimposed)WHITE = actualRED = design

  • Lectures at the IOWA STATE UNIVERSITY April 2009VIA PAVESEEXPECTED RESULTS*: DELAYS (weekday AM peak scenario ):(*) Values obtained by SETRA model for large roundabouts.

    EntryE[t] beforeE[t] design (sec/veic)%LoSBeforeLoSDesign1) Viale Ariosto (Ovest)145- 9- 64%BA2) Via Osmannoro43- 1- 25%AA3) Viale Ariosto (Est)83,5- 4,5- 56%AA4) Via Pavese> 609> - 50> - 90%FA

  • Lectures at the IOWA STATE UNIVERSITY April 2009VIA PAVESEEXPECTED RESULTS*: QUEUES (weekday AM peak scenario ):(*) Values obtained by SETRA model for large roundabouts.

    EntryL99 beforeL99 design (vehicles) (metres)%1) Viale Ariosto (Ovest)126- 6- 36- 50%2) Via Osmannoro43- 1- 6- 25%3) Viale Ariosto (Est)74- 3- 18- 43%4) Via Pavese> 308> - 20> - 120> - 90%

  • Lectures at the IOWA STATE UNIVERSITY April 2009VIA PAVESE (under construction)

  • VIA NERUDALectures at the IOWA STATE UNIVERSITY April 2009

  • Lectures at the IOWA STATE UNIVERSITY April 2009VIA NERUDA (under construction)DESIGN CATEGORY:The signal controlled intersection is replaced with a large roundabout. GEOMETRY FEATURES:

    Inscribed circle diameter (no shoulders)42,50 mGrassy central island radius9,25 mCirculatory roadway width9,50 mApron width2,00 mNumber of circulatory lanes2Number of entry lanes2 on 3 branches1 on 1 branch

  • Lectures at the IOWA STATE UNIVERSITY April 2009VIA NERUDA (before)Viale dei MilleVia NerudaViale Ariosto

  • Lectures at the IOWA STATE UNIVERSITY April 2009VIA NERUDA (design layout)

  • Lectures at the IOWA STATE UNIVERSITY April 2009VIA NERUDACOMPARISON BETWEEN DELAYS* (weekday AM peak scenario):(*) Values obtained by SETRA model (roundabout) and by HCS 5.2 (signalized intersection).

    EntryE[t] signalE[t] roundabout (sec/veic)%LoSsignalLoSround1) Viale Ariosto (Ovest)44,12,5- 41,6- 94%DA2) Via Neruda27,62,5- 25,1- 91%CA3) Viale Ariosto (Est)10,33- 7,3- 71%BA4) Viale dei Mille19,62,5- 17,1- 87%BA

  • Lectures at the IOWA STATE UNIVERSITY April 2009VIA NERUDACOMPARISON BETWEEN QUEUES* (weekday AM peak scenario):(*) Values obtained by SETRA model (roundabout) and by HCS 5.2 (signalized intersection).

    EntryL98 signalL99 roundabout (cars) (metres)%1) Viale Ariosto (Ovest)263- 23- 138- 88%2) Via Neruda113- 8- 48- 73%3) Viale Ariosto (Est)32- 1- 6- 33%4) Viale dei Mille83- 5- 30- 62%

  • Lectures at the IOWA STATE UNIVERSITY April 2009VIA NERUDA (the road yard wallpaper)

  • Lectures at the IOWA STATE UNIVERSITY April 2009VIA NERUDA (work in progress, April-July 2008)

  • IMPROVING ROAD SAFETY AND OPERATIONS OF URBAN ARTERIALS:The study-case of Viale Ariosto in Sesto Fiorentino, Florence (Italy) Antonio PratelliDepartment of Civil Engineering Vie e Trasporti University of Pisa (Italy) ISU Iowa DOT Meeting6th April 2009Many thanks for your attention