Volvo Driver Support Guide

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.

Driver Support Controls and Indicators in front of driver of a Volvo XC60 MY2015
Four active Driver Support functions in a Volvo XC60 MY2015. 1:BLIS, 2:ACC a) set speed b) leading vehicle speed c) actual speed, 3) time lag behind leading vehicle, 4:RSI. Text in upper right corner is in Swedish informing about the contents and its 23rd position in the Christmas Calendar of 2015. Separate photo (clicking on photo leads to post in Swedish)

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”

Ignorant use of black box data prevents car safety development

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 Nightly News video clip below and its transcript indicates a belief that “making cars safer” is a simple and reactive task to be carried out by “police and insurance companies” after accidents.

Nothing is said about multi-causal analyses and inter-disciplinary syntheses for proactive educational, technical and organizational improvements in the road traffic system.

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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.

Thanks, Scott Baker, for sharing the video
in the LinkedIn Group Accident Reconstruction.

Princess Diana killed by common police car manoeuvre?

Speeding and drunk driving does not automatically make you crash. A common police car following manoeuvre may better explain the directional deviation and crash killing the princess in August, 1997.

Video illustrating the PIT-manoeuvre used by the US Police to destabilize a car:
Further explanations in the (Swedish) post
Knuffen som stoppar bilmarodörer 
Republished referring to DN and Sky News August 17, 2013 and PDF report.

Truck accident reconstruction

This is a brief version of my reconstruction in Swedish.

Time counter numbers below refer to this video (opens in new window)
recorded by Ms. Gunn Iren Johnsrud and broadcast via TV2 in Norway.

1) Downhill slope forced driver to brake
– brake-light here at counter time 00:00:28 seconds

2) Snow-chains only on tractor rear right wheel. See TV2 photos on

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.

Fortsätt läsa “Truck accident reconstruction”

Bank effect on both Titanic and Costa Concordia?

– Crash reconstruction in English follows after intro in Swedish –

Olyckor har alltid flera orsaker. Men ett och samma fenomen från fysiken kan ha varit avgörande för de svåra skadorna både på Titanic 1912 och på Costa Concordia 2012.

Det beskriver jag nedan på engelska, eftersom jag inte har märkt av någon reaktion från farkostdynamisk expertis efter mina tidigare redogörelser på svenska. Se länkar till artiklarna i listan med etiketten Costa Concordia.

Däremot förekommer diverse spekulationer om andra orsaker, som förstås också kan ha bidragit. Men den optiska illusion, som Smithsonian beskriver enligt ett referat i DN, kan knappast ha haft någon betydelse för haveriet med Costa Concordia.

Eftersom både Titanic och Costa Concordia framfördes i hög fart nära is- respektive landmassor borde sugfenomenet uppmärksammas i utbildningen av ansvariga besättningar och trafikledare.

Problemet tycks vara välkänt för kaptener och styrmän på båtar i trånga farleder där hastigheten är låg men avstånden i sidled desto mindre. Men kanske har man hos de stora kryssningsrederierna inte tänkt på att de sugande sidkrafterna ökar kvadratiskt med hastigheten. Frågan är om det beaktas i det säkerhetsarbete, som beskrivs 30mars av DN.

Både Titanic och Costa Concordia uppges ha hållit nästan full fart vid sammanstötningen, trots att åtminstone Costa Concordia girade tvärt under storleksordningen en minut dessförinnan. Se rekonstruktionsbilden och vittnesuppgiften från Jan Mosander i den engelska texten nedan.

Same hazard behind Titanic and Costa Concordia disasters?

Both the 1912 Titanic and the 2012 Costa Concordia disasters may have been triggered by hydrodynamic suction forces. They will at least aggravate the damage and hull penetration in this type of lateral impact.

Nothing has been found, though, on this quite devious phenomenon in recent media interviews of various experts.

Fortsätt läsa “Bank effect on both Titanic and Costa Concordia?”

Rockband for Valentine’s day – Alla hjärtans dag

What can be more adequate to play on Valentine’s day in Sweden – than music by the rockband ie at Heart?

The video below shows a Live recording which was uploaded on its first “Valentine´s day”. In Sweden we call it “The day of Every Heart”, Alla hjärtans dag.

To be enjoyed anytime 🙂