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re: Concrete speed bumps

  • 1.  re: Concrete speed bumps

    Posted 14 February 2019 18:41
    Hello everyone

    We have serious issues on our local community roads with speeding vehicles posing a threat to the safety of pedestrians and other road users. We have tried several speed regulating devices (rubber speed humps, portable rumble strips, rubber speed cushions. ) but didn't help much. The community people approached seeking the installation of concrete speed bumps on the roads.

    I'm just wondering if concrete speed bumps can be used for traffic calming on Australian roads? Has anyone or council implemented concrete speed bumps in the past and what are the legal issues surrounding them? What are the standard specifications for design and installation? Any help or advice is much appreciated.

    regards
    Vikrant Jagarlamudi
    Roads Coordinator
    Roper Gulf Regional Council
    email: Vikrant.jagarlamudi@ropergulf.nt.gov.au
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  • 2.  RE: re: Concrete speed bumps

    Posted 17 February 2019 21:18
    Hi Vikrant,

    There is nothing preventing you from using concrete road humps in Australia if done correctly. I am aware of concrete cushions and humps being implemented elsewhere around the country including in Victoria and Queensland. In most cases these are quite old installations now as newer materials like rubber cushions have come on the market.

    But the question is why would you use concrete humps or cushions?

    Changing the material is unlikely to change the performance of the humps, and concrete is likely to be more expensive and less flexible than asphalt or rubber. Speed reduction at the device is affected by a number of factors but the main one is the gradient and height of the ramps. Too often I see narrow cushions or humps with shallow ramps implemented, which have very little speed reduction outcomes, where a wider cushion or steeper ramp on the cushion or hump will be more effective. Clearly this needs to be done safely with consideration to cyclists, etc. and I also understand that this is often impossible on bus routes. In those cases a horizontal deflection device may be more appropriate or effective.

    Again, if done correctly there should be no legal issues with use of concrete over asphalt, rubber or other materials. All need to be done safely including properly considering drainage, skid resistance, etc. I also note that maintenance of pavement markings / line markings can be an issue with concrete installations and careful consideration needs to be given to how that is managed over the life of the treatment.

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  • 3.  RE: re: Concrete speed bumps

    Posted 18 February 2019 21:50
    I wonder if speed humps are of any value at all,
    modern suspension systems deal with them ​with ease
    even if some drivers do slow down they are normally on the accelerator on exit
    my argument would be that a driver driving to the conditions and covering the brake
    will always stop quicker than someone on the accelerator
    I personally had a near miss while accelerating out of a speed hump even though I was travelling  only at 30km/hour,
    moving my foot from the accelerator to the brake considerably reduced my stopping time.
    Speed humps are also  generally put in with no consideration of drainage and the increased ponding they cause.
    With self drive in the near future and generally increased electronic driving aids surely all speeding issues could be resolved with a stoke of a pen with Governments requiring  manufactures to link GPS with mapped speed limits

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