The April 7 terror attack in Stockholm became more dangerous due to roadblockers in the Drottninggatan street. A strike by a 12000kg truck at 70km/h may eject an unrestrained 1000kg concrete block at 100km/h.
Well anchored stationary devices may stop the truck chassis, but if the barrier is too stiff, truck parts will become separate projectiles threatening people downstreams, like in the video below.
Modern Volvo Cars offer great driving pleasure and safety with the Driver Support option. However, functions contained vary significantly between series and Model Years. Submit your questions for me to answer with free clarifying tables.
The Driver Support option was introduced by Volvo in Model Year 2009 of the XC60 SUV. Since then, the DS package has been extended with new functions and improved performance varying between manufacturing weeks and model series. Fortsätt läsa “Volvo Driver Support Guide”
Hazard detection and safety development is threatened by driver-blaming use of recorded pre-crash data from cars involved in accidents. Inhuman system properties remain undetected, if reconstructions focus on individual guilt.
The public and authority attitude to accident “causes” seems embarrasingly equal to that of witchcraft centuries ago. Safety-irrelevant but illegal or immoral deviations from normal behaviour are alleged to blame an individual for accidental damage, though it is unintentional by definition.
Thereby, complex interactions and unknown hazards in the biological, technical and social systems may remain unknown to strike other individuals in various future combinations.
Bromsa inte i gupp eller på vägbulor! Det gjorde polisen på motorcykeln i den här videon, som visar hur bakhjulet lättar. Då blir även bilar instabila.
Crash explanation in English:
Probably the driver applied (front) brakes hard on the bump – making the vehicle unstable in all three angular degrees-of-freedom: First Pitch, then Yaw, inducing Roll instability, too.
Troligen har föraren tvärbromsat (åtminstone framhjulet) på guppet.
🙂 Tack till Johan Granlund som upptäckte videoklippet och delade det på Facebook.
Johan har massor med fina tips även på LinkedIn och på Hakkapedia. Kanske kan vi i den ideella föreningen VETA få honom att dessutom medverka som skribent på veta.se
3) Road banking applied gravity side forces irresistible to (braked) front wheels.
Tracks in snow deviate to right (00:00:35) – though driver steers left:
see front wheel at 00:00:34, 35 and 38 seconds
4) Superior braking and side forces on tractor rear right wheel add to clockwise moment (turning tractor to right) irrespective of driver’s full left steering.