Mike "Wuzzy121". Rest in peace, brother

Go Back   Tacoma World Forums > Off-Topic > General Automotive

Notices

How accurate are police investigations of speed after an accident?

Reply
 
Thread Tools Search this Thread
Old 05-24-2011, 06:12 PM   #1
PWhite13 [OP] PWhite13 is offline
Senior Member
PWhite13 is one of the sharper tools in the shedPWhite13 is one of the sharper tools in the shedPWhite13 is one of the sharper tools in the shedPWhite13 is one of the sharper tools in the shedPWhite13 is one of the sharper tools in the shedPWhite13 is one of the sharper tools in the shedPWhite13 is one of the sharper tools in the shedPWhite13 is one of the sharper tools in the shedPWhite13 is one of the sharper tools in the shedPWhite13 is one of the sharper tools in the shedPWhite13 is one of the sharper tools in the shed
 
PWhite13's Avatar
Name: Prescott
Joined: Apr 2010, #35075
Location: Southern California
Gender: Male
Posts: 478
PWhite13's Tacoma Gallery
How accurate are police investigations of speed after an accident?

Hi all,
Just curious as to how accurate a traffic officer's investigation is in terms of vehicle speed after an accident?
  Reply With Quote
Old 05-24-2011, 06:15 PM   #2
Babytruck, babytruck...I've got a babytruck :)
babytruck is one of the sharper tools in the shedbabytruck is one of the sharper tools in the shedbabytruck is one of the sharper tools in the shedbabytruck is one of the sharper tools in the shedbabytruck is one of the sharper tools in the shedbabytruck is one of the sharper tools in the shedbabytruck is one of the sharper tools in the shedbabytruck is one of the sharper tools in the shedbabytruck is one of the sharper tools in the shedbabytruck is one of the sharper tools in the shedbabytruck is one of the sharper tools in the shed
 
babytruck's Avatar
Joined: May 2011, #56797
Location: NorCal
Gender: Female
Posts: 9,051
babytruck's Tacoma Gallery
Oh there HAS to be a backstory to this....
  Reply With Quote
Old 05-24-2011, 06:16 PM   #3
Senior Member
Blasphemous is one of the sharper tools in the shedBlasphemous is one of the sharper tools in the shedBlasphemous is one of the sharper tools in the shedBlasphemous is one of the sharper tools in the shedBlasphemous is one of the sharper tools in the shedBlasphemous is one of the sharper tools in the shedBlasphemous is one of the sharper tools in the shedBlasphemous is one of the sharper tools in the shedBlasphemous is one of the sharper tools in the shedBlasphemous is one of the sharper tools in the shedBlasphemous is one of the sharper tools in the shed
Name: Mike
Joined: Apr 2011, #54632
Location: San Fernando Valley, CA
Gender: Male
Posts: 630
Blasphemous's Tacoma Gallery
Need story first.
  Reply With Quote
Old 05-24-2011, 06:16 PM   #4
Canadian Bacon
spares is one of the sharper tools in the shedspares is one of the sharper tools in the shedspares is one of the sharper tools in the shedspares is one of the sharper tools in the shedspares is one of the sharper tools in the shedspares is one of the sharper tools in the shedspares is one of the sharper tools in the shedspares is one of the sharper tools in the shedspares is one of the sharper tools in the shedspares is one of the sharper tools in the shedspares is one of the sharper tools in the shed
 
spares's Avatar
Joined: Sep 2010, #43710
Location: New Brunswick, Canada
Gender: Male
Posts: 335
spares's Tacoma Gallery
Quote:
Originally Posted by babytruck View Post
Oh there HAS to be a backstory to this....
  Reply With Quote
Old 05-24-2011, 06:20 PM   #5
Senior Member
mjohn617 is one of the sharper tools in the shedmjohn617 is one of the sharper tools in the shedmjohn617 is one of the sharper tools in the shedmjohn617 is one of the sharper tools in the shedmjohn617 is one of the sharper tools in the shedmjohn617 is one of the sharper tools in the shedmjohn617 is one of the sharper tools in the shedmjohn617 is one of the sharper tools in the shedmjohn617 is one of the sharper tools in the shedmjohn617 is one of the sharper tools in the shedmjohn617 is one of the sharper tools in the shed
 
mjohn617's Avatar
Coast Guard: National Strike Force
Joined: Mar 2010, #33314
Location: Petaluma, CA
Gender: Dude
Posts: 744
mjohn617's Tacoma Gallery
I LOVE this shit! I read headlines on TW like this everyday...CNN does have squat on us!

Oh do tell...
  Reply With Quote
Old 05-24-2011, 06:20 PM   #6
:POOPCORN:
98tacoma27 is one of the sharper tools in the shed98tacoma27 is one of the sharper tools in the shed98tacoma27 is one of the sharper tools in the shed98tacoma27 is one of the sharper tools in the shed98tacoma27 is one of the sharper tools in the shed98tacoma27 is one of the sharper tools in the shed98tacoma27 is one of the sharper tools in the shed98tacoma27 is one of the sharper tools in the shed98tacoma27 is one of the sharper tools in the shed98tacoma27 is one of the sharper tools in the shed98tacoma27 is one of the sharper tools in the shed
 
98tacoma27's Avatar
Marines:
Name: Ben
Joined: Dec 2008, #11714
Location: Beech Creek
Gender: Dude
Posts: 52,623
98tacoma27's Tacoma Gallery
Good question for the LEO's. I think Tigerfan has training in that area. It's also basic physics, so I'd say it's pretty accurate.
  Reply With Quote
Old 05-24-2011, 06:23 PM   #7
Canadian Bacon
spares is one of the sharper tools in the shedspares is one of the sharper tools in the shedspares is one of the sharper tools in the shedspares is one of the sharper tools in the shedspares is one of the sharper tools in the shedspares is one of the sharper tools in the shedspares is one of the sharper tools in the shedspares is one of the sharper tools in the shedspares is one of the sharper tools in the shedspares is one of the sharper tools in the shedspares is one of the sharper tools in the shed
 
spares's Avatar
Joined: Sep 2010, #43710
Location: New Brunswick, Canada
Gender: Male
Posts: 335
spares's Tacoma Gallery
im guessin op was doin 90 mph, 144 km/h
  Reply With Quote
Old 05-24-2011, 06:26 PM   #8
Senior Member
mjohn617 is one of the sharper tools in the shedmjohn617 is one of the sharper tools in the shedmjohn617 is one of the sharper tools in the shedmjohn617 is one of the sharper tools in the shedmjohn617 is one of the sharper tools in the shedmjohn617 is one of the sharper tools in the shedmjohn617 is one of the sharper tools in the shedmjohn617 is one of the sharper tools in the shedmjohn617 is one of the sharper tools in the shedmjohn617 is one of the sharper tools in the shedmjohn617 is one of the sharper tools in the shed
 
mjohn617's Avatar
Coast Guard: National Strike Force
Joined: Mar 2010, #33314
Location: Petaluma, CA
Gender: Dude
Posts: 744
mjohn617's Tacoma Gallery
I want to see pics of his truck...recent pics!
  Reply With Quote
Old 05-24-2011, 06:27 PM   #9
Member
tommyc is on a distinguished road
Name: tommy
Joined: May 2011, #57176
Gender: Guy
Posts: 51
tommyc's Tacoma Gallery
Well dude the police officer is going to take everything into account, he/she needs to come to a conclusion and then write the accident report based upon what information was given to them and make there own assessment of what they think happened. so once it has been written there is no changing it.

But more detail is needed to give you a correct response.. so spill it
  Reply With Quote
Old 05-24-2011, 06:36 PM   #10
Senior Member
2010nctaco is a splendid one to behold2010nctaco is a splendid one to behold2010nctaco is a splendid one to behold2010nctaco is a splendid one to behold2010nctaco is a splendid one to behold2010nctaco is a splendid one to behold2010nctaco is a splendid one to behold
 
2010nctaco's Avatar
Law Enforcement: Trooper
Name: Blake
Joined: Apr 2010, #34845
Location: Concord NC
Gender: Male
Posts: 179
2010nctaco's Tacoma Gallery
Just depends on all the factors involved. Actually kind of easy to find a minimum speed if there is a yaw mark left on the road(when a car starts to rotate. Back tires start to track outside the front ones). Just find the friction of the tires and roadway with a drag sled. The find the radius and then put it into the formula. Sounds complicated but really not that bad. But most officers probably guess, unless its a bad wreck.
  Reply With Quote
Old 05-24-2011, 06:45 PM   #11
PWhite13 [OP] PWhite13 is offline
Senior Member
PWhite13 is one of the sharper tools in the shedPWhite13 is one of the sharper tools in the shedPWhite13 is one of the sharper tools in the shedPWhite13 is one of the sharper tools in the shedPWhite13 is one of the sharper tools in the shedPWhite13 is one of the sharper tools in the shedPWhite13 is one of the sharper tools in the shedPWhite13 is one of the sharper tools in the shedPWhite13 is one of the sharper tools in the shedPWhite13 is one of the sharper tools in the shedPWhite13 is one of the sharper tools in the shed
 
PWhite13's Avatar
Name: Prescott
Joined: Apr 2010, #35075
Location: Southern California
Gender: Male
Posts: 478
PWhite13's Tacoma Gallery
Hahah you guys are funny man. Well, basically I was driving, somehow took my eyes off the road, next thing I know I'm crashing into not one, but TWO light poles. I swear to this day I remember only doing 55 mph. (Speed limit was 50 mph.) The traffic officer wrote me a citation for 70 mph in a 50 mph.

What's so difficult about the situation is that I don't really doubt the officer's investigation but I seriously do not remember doing 70 and the fastest I drive would be 5 over the limit. Always.

Well that's the story.

Oh and the brakes were not even touched until after I went off the road, I guess I panicked and didn't even know what the hell was happening so I never hit them. I'm not sure if the officer took this into account.
  Reply With Quote
Old 05-24-2011, 06:45 PM   #12
Senior Member
2010nctaco is a splendid one to behold2010nctaco is a splendid one to behold2010nctaco is a splendid one to behold2010nctaco is a splendid one to behold2010nctaco is a splendid one to behold2010nctaco is a splendid one to behold2010nctaco is a splendid one to behold
 
2010nctaco's Avatar
Law Enforcement: Trooper
Name: Blake
Joined: Apr 2010, #34845
Location: Concord NC
Gender: Male
Posts: 179
2010nctaco's Tacoma Gallery
S=3.86√r(f+-e)

S=speed @beginning of yaw
R=radius of yaw mark
f=coefficient of friction
e=superelevation or bank of roadway

Here is the formula for a spinout. Maybe this will help you. Sorry, I love reconstruction. My thing.
  Reply With Quote
Old 05-24-2011, 06:50 PM   #13
Senior Member
nvdeserted is one of the sharper tools in the shednvdeserted is one of the sharper tools in the shednvdeserted is one of the sharper tools in the shednvdeserted is one of the sharper tools in the shednvdeserted is one of the sharper tools in the shednvdeserted is one of the sharper tools in the shednvdeserted is one of the sharper tools in the shednvdeserted is one of the sharper tools in the shednvdeserted is one of the sharper tools in the shednvdeserted is one of the sharper tools in the shednvdeserted is one of the sharper tools in the shed
 
nvdeserted's Avatar
Joined: Nov 2008, #11062
Location: Reno, NV
Gender: Male
Posts: 1,307
nvdeserted's Tacoma Gallery
From my one experience with this, I would have to say they are horribley inaccurate. Buddy, hit a pole at 15mph (while doing a burnout), cops said he was doing 50+ becuse of the marks on the ground... which were burnout marks, not brake marks...
  Reply With Quote
Old 05-24-2011, 06:53 PM   #14
PWhite13 [OP] PWhite13 is offline
Senior Member
PWhite13 is one of the sharper tools in the shedPWhite13 is one of the sharper tools in the shedPWhite13 is one of the sharper tools in the shedPWhite13 is one of the sharper tools in the shedPWhite13 is one of the sharper tools in the shedPWhite13 is one of the sharper tools in the shedPWhite13 is one of the sharper tools in the shedPWhite13 is one of the sharper tools in the shedPWhite13 is one of the sharper tools in the shedPWhite13 is one of the sharper tools in the shedPWhite13 is one of the sharper tools in the shed
 
PWhite13's Avatar
Name: Prescott
Joined: Apr 2010, #35075
Location: Southern California
Gender: Male
Posts: 478
PWhite13's Tacoma Gallery
Quote:
Originally Posted by nvdeserted View Post
From my one experience with this, I would have to say they are horribley inaccurate. Buddy, hit a pole at 15mph (while doing a burnout), cops said he was doing 50+ becuse of the marks on the ground... which were burnout marks, not brake marks...
This is what I'm afraid of. The whole situation was odd because they barely questioned me about the incident and they allowed two witnesses to leave without a statement.
  Reply With Quote
Old 05-24-2011, 07:04 PM   #15
Senior Member
chvymechanic is on a distinguished road
Name: Thomas
Joined: Mar 2010, #34222
Location: New Hampshire
Age: 30
Gender: Male
Posts: 392
chvymechanic's Tacoma Gallery
Send a message via AIM to chvymechanic
I had a very serious accident back in 2006. I fell asleep and drifted lanes went off the road flipped it twice and rolled it 4 times, since I was asleep I never hit the brakes and there were no yaw marks. Anyways cops did their thing reconstructed the accident and came to the conclusion I was doing 90 mph (posted speed is 45mph). I denied this and said I was doing 45mph. It was later proved that I was indeed doing 45mph, the computer in my vehicle recorded it since I had my cruise control set. So I got off with no ticket. The whole cop reconstruction was complete bullshit!
  Reply With Quote
Old 05-24-2011, 07:12 PM   #17
PWhite13 [OP] PWhite13 is offline
Senior Member
PWhite13 is one of the sharper tools in the shedPWhite13 is one of the sharper tools in the shedPWhite13 is one of the sharper tools in the shedPWhite13 is one of the sharper tools in the shedPWhite13 is one of the sharper tools in the shedPWhite13 is one of the sharper tools in the shedPWhite13 is one of the sharper tools in the shedPWhite13 is one of the sharper tools in the shedPWhite13 is one of the sharper tools in the shedPWhite13 is one of the sharper tools in the shedPWhite13 is one of the sharper tools in the shed
 
PWhite13's Avatar
Name: Prescott
Joined: Apr 2010, #35075
Location: Southern California
Gender: Male
Posts: 478
PWhite13's Tacoma Gallery
Quote:
Originally Posted by chvymechanic View Post
I had a very serious accident back in 2006. I fell asleep and drifted lanes went off the road flipped it twice and rolled it 4 times, since I was asleep I never hit the brakes and there were no yaw marks. Anyways cops did their thing reconstructed the accident and came to the conclusion I was doing 90 mph (posted speed is 45mph). I denied this and said I was doing 45mph. It was later proved that I was indeed doing 45mph, the computer in my vehicle recorded it since I had my cruise control set. So I got off with no ticket. The whole cop reconstruction was complete bullshit!
Damn man, that's crazy. Being off by 45 mph is a pretty huge margin, can't believe they were off by that much. What kind of car did you have when you crashed? My cruise control wasn't set so I probably can't use that, unless it's recorded anyway.
  Reply With Quote
Old 05-24-2011, 07:14 PM   #18
Senior Member
Scott78 is on a distinguished road
 
Scott78's Avatar
Name: Scott
Joined: Oct 2010, #45292
Location: Vacaville, CA
Gender: Male
Posts: 374
Scott78's Tacoma Gallery
Quote:
Originally Posted by 2010nctaco View Post
S=3.86√r(f+-e)

S=speed @beginning of yaw
R=radius of yaw mark
f=coefficient of friction
e=superelevation or bank of roadway

Here is the formula for a spinout. Maybe this will help you. Sorry, I love reconstruction. My thing.
I think you're missing the d for distance....
  Reply With Quote
Old 05-24-2011, 07:15 PM   #19
PWhite13 [OP] PWhite13 is offline
Senior Member
PWhite13 is one of the sharper tools in the shedPWhite13 is one of the sharper tools in the shedPWhite13 is one of the sharper tools in the shedPWhite13 is one of the sharper tools in the shedPWhite13 is one of the sharper tools in the shedPWhite13 is one of the sharper tools in the shedPWhite13 is one of the sharper tools in the shedPWhite13 is one of the sharper tools in the shedPWhite13 is one of the sharper tools in the shedPWhite13 is one of the sharper tools in the shedPWhite13 is one of the sharper tools in the shed
 
PWhite13's Avatar
Name: Prescott
Joined: Apr 2010, #35075
Location: Southern California
Gender: Male
Posts: 478
PWhite13's Tacoma Gallery
Quote:
Originally Posted by 2010nctaco View Post
S=3.86√r(f+-e)

S=speed @beginning of yaw
R=radius of yaw mark
f=coefficient of friction
e=superelevation or bank of roadway

Here is the formula for a spinout. Maybe this will help you. Sorry, I love reconstruction. My thing.
I never actually spunout. I basically went onto the curb in a straight path and completely took out two light poles, parallel to the road. Hope that made sense.
  Reply With Quote
Old 05-24-2011, 07:19 PM   #20
Senior Member
chvymechanic is on a distinguished road
Name: Thomas
Joined: Mar 2010, #34222
Location: New Hampshire
Age: 30
Gender: Male
Posts: 392
chvymechanic's Tacoma Gallery
Send a message via AIM to chvymechanic
I had a 2000 Chevy S-10. I didn't think that truck could keep record of it but hey I didn't get a ticket so I guess it could. The cops were real eager to give me a ticket since I had a really bad driving record (speeding tickets) that the only accident I have ever been in. So I am glad it could and really glad I had set my cruise.
  Reply With Quote
Reply

Thread Tools Search this Thread
Search this Thread:

Advanced Search

Similar Threads
Thread Thread Starter Forum Replies Last Post
accurate odo after tire swap? bt08231 Wheels & Tires 17 02-01-2012 11:52 AM
Why is my speedometer not accurate? Claudio D Technical Chat 33 11-16-2011 08:52 AM
How accurate is your speedo? 4X42HEL 2nd Gen. Tacomas 14 07-26-2010 04:22 PM
Speedo is not accurate... WiTEtaco09 Wheels & Tires 5 08-24-2009 02:03 AM
How accurate is the speedo... Tilt 2nd Gen. Tacomas 6 03-30-2009 06:21 PM


Copyright © 2014 Tacoma Forum. Tacoma World is not owned by, or affiliated with Toyota Motor Corporation.