Safe Speed Forums

The campaign for genuine road safety
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PostPosted: Fri Jun 17, 2005 14:56 
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Joined: Fri Apr 01, 2005 12:06
Posts: 72
Location: London
IanH, Cotswold and the other Police officer that post here are the reason I gave so much consideration and thought to the question of speed cameras.

I always had my view basted on my experiences and observations but the posts of people that have to attend the fatal RTA and inform the families the people that police the road and see the real causation of accidents are real eye openers and I can’t find fault in any thing they have said.

Please keep up the post excellent informative posts.


I just with there was a way to have road safety given over to a total independent body run by people like you with only one brief.

Save lives and keep the roads moving at the appropriate safe speeds.


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PostPosted: Fri Jun 17, 2005 21:44 
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Joined: Sat Mar 27, 2004 13:50
Posts: 2643
stevei wrote:
Not true - both distance and time create exposure. Park your vehicle in the outer lane of a motorway and you have exposure due to time, but no distance travelled.


I've only seen this post now, so please forgive the late reply.
I suspect my posting in another thread has already answered this one.
If not, consider that exposure is only proportional to distance if speed remains constant. As an example, imagine a window that a sniper is taking random pot shots at. You have to get past the window. If you run past the window you have less chance of being hit than if you walk past.
If you increase the width of the window you have to run even faster to keep your risk down. The risk is proportional to the time it takes to pass the window.

Quote:
On the other hand, imagine you have a vehicle so fast that you can travel 100 miles along a motorway in a fraction of a second. The time is very small, but the distance creates exposure, indeed you would be almost certain to hit someone in that fraction of a second.


From such an incredibly high speed your stopping time would be extremely long (in the order of days) - and it's your stopping time which decides the risk. So, in that imaginary scenario, your risk of hitting something would be extremely high indeed.

Cheers
Peter


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