• Had a bit of a think about some of the issues raised above - did you guys ever see deformable bollards [like at race tracks, or on the motorway] There are many differing types, but here is one english version I found after a small amount of searching:

    http://www.rediweld.co.uk/traffic/crash_friendly-jislon_highways.asp

    One drawback may be getting smacked after it pops back up, although my intuition veers towards it being managable.

    There are many types of deformable posts/bollards/markers varying in height and construction, but it would be sensible to find the most readily available type for use.

    It may be possible to obtain samples for trials, I have not looked into it yet.

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