Safety in Road-Construction areas. 360 Conference bro

Transcription

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2 Safety in Road-Construction areas 360 Conference bro

3 Today s Speaker! Pezzucchi Matteo Norwegian Public Road Administration (NPRA) Control and approval of road equipment: Safety barriers transitions terminals Crash cushions TMAs Columns Sign supports Matteo.pezzucchi@vegvesen.no

4 Safety in Road-Building areas! The safety of road work areas and road users! Today s focus is on how road equipment are approved, why is it important to use approved products, why is it so important that the products are used properly

5 Approved products! Devices that contain and/or redirect vehicles and meet the crashworthiness evaluation criteria Safety barriers NS-EN1317: Concrete barriers Steel barriers Ballast filled barriers TMA report350 or M.A.S.H. Shadow vehicles with attenuators Arresting systems

6 Vehicle Restrain Systems

7 Temporary barriers! Safety barriers for work zone areas (HB 231, table 3.1) temporary installations: Class T1, speed limit < 50 km/h Class T2, speed limit 60 or 70 km/h Class T3, speed limit 60 km/h, ÅDT>4000, 20% trucks speed limit 70 km/h, ÅDT>4000 highways and high risk roads

8 EN1317 tests! Temporary barriers -> low containment barriers Containment levels Acceptance test Low angle containment T1 TB 21 T2 TB 22 T3 TB 41 and TB 21 Test Impact speed km/h Impact angle Total mass Kg Type of vehicle TB Car TB 21 TB 22 TB Car Car Car TB Car TB 41 TB 42 TB 51 TB 61 TB 71 TB Rigid HGV Rigid HGV Bus Rigid HGV Rigid HGV Articulated HGV

9 Possible Use! Ballast filled barriers Minimize installation and removal costs (Easy to transport) Easy to identify - Urban area use Different possible filling: sand & water! Steel barriers Long and short-term work (daily basis) Relatively easy and quick installation Easy to anchor if needed! Concrete barriers Low maintenance cost but high installation costs long-term work Generally preferable for high ÅDT roads

10 Temporary safety barriers! Others consideration: Adequate space is required for heavy vehicles working width must be related to the available space Consideration for access points at the work zone Exposed barrier ends must be protected The installation manual

11 Truck Mounted Attenuator

12 Premise! A European Standard for Truck Mounted Attenuators (TMAs) is under development An initial meeting was held on the 10 th November 2011 Topics discussed included: The name of the items being covered by the standard Methods of working Currently existing and published National requirements Scope of the work Time scales! 15 countries were represented test houses, manufacturers, researchers and National Authorities

13 Output! There might be: Small and simple TMA s for urban areas, Effective TMA s for the rural roads, High containments for higher speeds roads and heavy trucks! General agreement on: Concentrate on reducing the risk for both road users and workers Have the possibility to connect them to different structures/vehicles try to use the already existing standard

14 NCHRP report 350 and M.A.S.H! Test series 3-50, 51, 52, C kg 2270 P kg! Shadow vehicles 10 tons

15 Test with shadow vehicle! Shadow vehicles are moving trucks with attenuators spaced a short distance from a moving operation giving physical protection to workers from traffic approaching from rear

16 Roll-Ahead Distance! TMA position:upstream from the obstacle/road-workers at a distance Examples of Spacing for Support Vehicle Speed limit Calculation Roll-Ahead Distance 50 km/h (50 / 2) + 10 = meters 70 km/h (70 / 2) + 10 = meters 90 km/h (90 / 2) + 10 = meters 100 km/h (100 / 2) + 10 = meters! When TMA is located on roads with low friction (snow or ice) the roll-ahead distance must be increased of 15 meters.! Follow the requirements within HB51 and 62

17 Our experience! Norwegian experience is based on the Swedish one! TMA s has been used in Sweden since the beginning of the 1990-ies and has grown to about 500 units until today.! There has been only few accidents with high injuries and fatalities related to TMA s.! The two mandatory NCHRPR 350 crash tests 3-50 and 3-51 plus at least one of the two (in US optional) tests 3-52 or 3-53! Exception can be given to the vehicles used in the American standard if the cars tested are representative of the means of transport on the European roads.

18 Alternatives! alternative TMA carriers such as: Articulated front-end loaders, Tractors, Rigid frame. has been accepted!! This can resulted in a safer work environment and a cost effective way of work!

19 TMA testing research! VTI test: tractors as shadow vehicles

20 TMA testing research! VTI test: hook-loader as shadow vehicles

21 TMA testing research! VTI test: road workers safety Whiplash and neck injuries

22 ! Conclusions Driver safety

23 How to choose?

24 Cost and benefits! VRS Vs. TMA Installation and removal costs make safety barriers less cost-effective for shorter term installation Safety barriers are less cost effective when used throughout work zones where work activities are present at a specific location for relativity short periods of time High risk for workers and road users to be exposed to hazard during installation and removal It is important that the safety equipment is used correctly because incorrect use can result in major, unforeseen consequences with respect to the safety of both workers and road users.

25 Decision tool Does the project involve a moving operation? No Is a short-term project? ( 1 hour) No Is an intermediate project? (>1 hour but 3 days) No Is a long-term project (>3 days) Yes Yes Yes Yes Are workers on a road operation vehicle? No Is there adequate roll ahead distance to protect workers? No filled or steel barrier + terminal crash cushion Are ease & rapidity of installation important factors? Is space for barriers deflection limited? Yes Yes No Yes Yes No operation vehicles with TMAs Is there a free corridor larger than >2,5m? No steel barrier + shadow vehicles with TMAs concrete barriers + TMA Yes shadow vehicles with TMAs Does the project have isolated work crew? No Filler or steel barrier + TMAs Yes Guidelines on the use of positive protection in temporary traffic control zones (ATSSA)

26 Increase workers risk! Traffic speed in the work area! High traffic volumes (trucks and heavy vehicles)! Type of work (work activities close to traffic flow)! Limited escape paths! Time of day (avoid pick hours extra care for night activities)! Type of device use (installation time)! Work area restriction - increase of accident! Access to/from work space

27 Future work! Field guide for the use of shadow vehicles and TMAs in working areas! Field guide on installation and removal of temporary traffic control for safe maintenance and work zone operations

28 Why to use approved products?

29 Acknowledgement VTI Forskningsingenjör-Research Engineer Linköping, Sweden Jan Wenäll

30 Thanks for Your Attention Pezzucchi Matteo

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