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Thread: What Science Says About Our Road Rules

  1. #26
    JBN
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    Quote Originally Posted by jaahn View Post
    Hi
    Sorry to break into the drivel. The scaryest thing I have seen for danger are the rural roads in Victoria, with an older meandering narrow roadway and a collanade of large big trees growing almost beside the roadway. Scary at night when all you can see are the two lines of trees in the lights. These roads also have full speed limits and hitting these trees would be hitting an immovable object.
    Jaahn
    Large trees near roadways seem to have an hypnotic effect at attracting vehicles.

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    The best trees near roadways, either on the sides or particularly between opposing lanes when space permits are small growing wattles. They are bushy and springy and can help a vehicle decelerate quickly and safely. In between opposing lanes of traffic, they are excellent at hiding oncoming glaring headlights as well as providing a safety buffer.

    John

  2. #27
    COL
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    Default Renault Laguna Crashing Into A Tree

    Regards Col

    1973 Renault R12 Station Wagon
    1976 Renault R12 Station Wagon
    1995 Renault Laguna V6
    2002 Renault Laguna V6
    1973 Alpine A110

    http://alpine-a110.weebly.com/

  3. #28
    1000+ Posts edgedweller's Avatar
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    What did you think was the most important reason behind developing autonomous cars?
    another reason for people to part with large amounts of money ...

  4. #29
    1000+ Posts schlitzaugen's Avatar
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    Nah, there'll be no one who wants to own one of those. They'll probably be owned as time share or big companies like trains and buses and you order one go wherever you want and go about your business.
    ACHTUNG ALLES LOOKENPEEPERS

    Das computermachine is nicht fur gefingerpoken und mittengrabben. Ist easy schnappen der springenwerk, blowenfusen und poppencorken mit spitssparken. Ist nicht fur gewerken bei das dummkopfen. Das rubbernecken sightseeren keepen hands in das pockets-relaxen und watch das blinkenlights.

  5. #30
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    Quote Originally Posted by JoBo View Post
    Why not 30km/h then? The wowsers are saying that a pedestrian hit @ 30km/h has a good chance of surviving. Unreasonable? Not when the common acquiescence is that pedestrians are to be protected even though a lot of them walk onto roadways totally oblivious to others . What ever happened to the Darwinian principle?
    30km would be a sensible speed around schools and in quiet cul-de-sacs, if we had designed streets where you then turn into a 80km/h or 100km/h distributing road that doesn't have footpaths or bicycles on it to get towards your destination, then back to the safer 30km/h street just for the last little segment to your arrival. Canberra for all its faults got pretty close to that except with too many bicycle lanes on the roads. But even them or the Dutch still have similar rates of "accidents" even with pedestrians, so once it feels safe pedestrians/drivers/cyclists etc just do even stupider things and we end up with a nice feeling place but not all that safer.
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    406 HDi

  6. #31
    JBN
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    I would have thought planting big trees around school areas would keep the kids safe, even from looney Laguna drivers.

    John
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  7. #32
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    Bollards, more bollards!

    But back on a serious note.
    Quote Originally Posted by 1972Ren View Post
    Hi,
    I've seen this 80+80=160 idea disputed, but personally I cant see how two cars hitting head on is any different to one of them hitting a stationary one at 160. However, that admitted show pony know all John Cadogan, who claims to be an engineer, insists that it isn't. Either way, the comparison to hitting a solid object is completely irrelevant, as cars are not solid objects. Two cars each doing 80 might be worse than hitting a block of cement at 80, or maybe not. I don't see that you can know that without giving it a go and observing.
    There is a simple explanation to the 80 + 80 = 80 reality, first watch this video:
    https://www.youtube.com/watch?v=ZJt_dJ6j54A
    Even with a substantial difference in the weights of the vehicles when they collide the smaller car doesn't really get pushed back. If you put a concrete block at the point of impact it wouldn't be much different to what happened in that head on.


    But, change that to a crash between a car and a b-double:
    https://www.youtube.com/watch?v=7Ym9yPWzJgE
    And the 20 times heavier vehicle doesn't slow down much at all, now you've got the 80 + 80 = 160
    406 HDi

  8. #33
    JBN
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    Goodness knows what was on the mind of the victim or indeed if the mind was switched on at the time. I am glad a B-double hit him rather than another vehicle. Drivers really need to be switched on or otherwise they should stay at home.

    John

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