## Skidmark Speed Nomograph

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• Can someone give a small example of how the Skidmark Speed Nomograph is used/applied. I´m preparing the materials for a drivers course for our employees
Message 1 of 6 , Feb 7, 2001
Can someone give a small example of how the Skidmark Speed Nomograph
is used/applied. I´m preparing the materials for a drivers course
for our employees (ambulance designated driver) and I´m not sure I
have figured out how to use the skidmark speed nomograph (FEMA
Emergency Vehicle Driver Training).

Does distance tell me how far the vehicle will skid at a given speed;
or the speed according to the length of the skidmarks?

Thanks for the Help!!

Thomas
• Can someone give a small example of how the Skidmark Speed Nomograph is used/applied. I´m preparing the materials for a drivers course for our employees
Message 2 of 6 , Feb 7, 2001
Can someone give a small example of how the Skidmark Speed Nomograph
is used/applied. I´m preparing the materials for a drivers course
for our employees (ambulance designated driver) and I´m not sure I
have figured out how to use the skidmark speed nomograph (FEMA
Emergency Vehicle Driver Training).

Does distance tell me how far the vehicle will skid at a given speed;
or the speed according to the length of the skidmarks?

Thanks for the Help!!

Thomas
• Hi Thomas, . As I have been taught , it is more than the length to gage the speed. It has somewhat the composit of the roadway . Concrete, type, blacktop
Message 3 of 6 , Feb 7, 2001
Hi Thomas, . As I have been taught , it is more than the length to gage the
speed. It has somewhat the composit of the roadway . Concrete, type,
blacktop and or the weather conditions. Even humidity can effect the
outcome, Rubber composit of the tires etc.. Tom Hoy AM/PM
Investigations Int'.
• Ive got no idea! Sorry!!
Message 4 of 6 , Feb 7, 2001
Ive got no idea! Sorry!!
• Danny; Thanks for the information, I appreciate your help! Sincerely, Thomas
Message 5 of 6 , Feb 8, 2001
Danny;

Thanks for the information, I appreciate your help!

Sincerely,

Thomas

> -----Original Message-----
> From: Danny Horton [SMTP:dhorton@...]
> Sent: Thursday, February 08, 2001 11:35 AM
> To: infoguys-list@yahoogroups.com
> Subject: Re: [infoguys-list] Skidmark Speed Nomograph
>
> Thomas,
>
> I assume you are using the Northwestern or IPTM templates. I am not
> familiar with any other, but I guess they will be the same.
>
> If you take a straight edge and lay it across the information you have,
> such as distance and drag factor, you can determine the speed, and feet
> per second. If you don't know the drag factor, do what most who use the
> template do and use the average. The average for a well traveled, dry
> asphalt will be .70. Some investigators use .65, so use both to get an
> idea. .55 will be an average for wet asphalt. .80 will be an average for
> concrete, and sometimes new asphalt.
>
> Conversely, if you have the drag factor and the speed and you want the
> distance traveled then line those figures up and read up the scale. The
> template is not that accurate so please don't expect to testify from the
> information. It is a good tool to get an idea, and a very close idea of
> the speed and that is all. It will help an investigator determine, within
> a ball park, what the speed is when they are measuring skidmarks.
> Measuring skidmarks is another story.
>
> Good luck. Let me know if I can help.
>
> Danny Horton, CLI, MCI, CFC
> Post Office Box 8
> Iuka, Mississippi 38852
>
> Office: 662-424-9524
> Fax: 662-423-1137
> Pager: 877-215-7117
>
> email: dhorton@...
> <mailto:dhorton@...>
> web: <http://www.legalinvestigator.com>
>
> ----- Original Message -----
> From: Thomas.S.Kauffman@...
> <mailto:Thomas.S.Kauffman@...>
> To: infoguys-list@yahoogroups.com
> <mailto:infoguys-list@yahoogroups.com>
> Sent: Wednesday, February 07, 2001 2:38 PM
> Subject: [infoguys-list] Skidmark Speed Nomograph
>
> Can someone give a small example of how the Skidmark Speed Nomograph
>
> is used/applied. I?m preparing the materials for a drivers course
> for our employees (ambulance designated driver) and I?m not sure I
> have figured out how to use the skidmark speed nomograph (FEMA
> Emergency Vehicle Driver Training).
>
> Does distance tell me how far the vehicle will skid at a given
> speed;
> or the speed according to the length of the skidmarks?
>
> Thanks for the Help!!
>
> Thomas
>
>
>
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• Thomas, I assume you are using the Northwestern or IPTM templates. I am not familiar with any other, but I guess they will be the same. If you take a straight
Message 6 of 6 , Feb 8, 2001
Thomas,

I assume you are using the Northwestern or IPTM templates.  I am not familiar with any other, but I guess they will be the same.

If you take a straight edge and lay it across the information you have, such as distance and drag factor, you can determine the speed, and feet per second.  If you don't know the drag factor, do what most who use the template do and use the average.  The average for a well traveled, dry asphalt will be .70.  Some investigators use .65, so use both to get an idea.  .55 will be an average for wet asphalt.  .80 will be an average for concrete, and sometimes new asphalt.

Conversely, if you have the drag factor and the speed and you want the distance traveled then line those figures up and read up the scale.  The template is not that accurate so please don't expect to testify from the information.  It is a good tool to get an idea, and a very close idea of the speed and that is all.  It will help an investigator determine, within a ball park, what the speed is when they are measuring skidmarks.  Measuring skidmarks is another story.

Good luck.  Let me know if I can help.

Danny Horton, CLI, MCI, CFC
Post Office Box 8
Iuka, Mississippi 38852

Office: 662-424-9524
Fax:     662-423-1137
Pager: 877-215-7117

----- Original Message -----
Sent: Wednesday, February 07, 2001 2:38 PM
Subject: [infoguys-list] Skidmark Speed Nomograph

Can someone give a small example of how the Skidmark Speed Nomograph
is used/applied.  I´m preparing the materials for a drivers course
for our employees (ambulance designated driver) and I´m not sure I
have figured out how to use the skidmark speed nomograph (FEMA
Emergency Vehicle Driver Training).

Does distance tell me how far the vehicle will skid at a given speed;
or the speed according to the length of the skidmarks?

Thanks for the Help!!

Thomas

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