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Impairment begins at .01

Last post 04-04-2007, 5:05 AM by motomojo. 6 replies.
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  •  09-28-2006, 10:26 AM 65

    Impairment begins at .01

    "It is unknown at precisely what [blood alcohol] levels motorcycle-specific judgment and skills are impaired," says NAMS (p25). My small contribution to this problem suggests that for some riders, and to some extent, impairment begins at .01 BAC.

    It is believed that drunk riders are more likely to be involved in single-vehicle crashes than are sober riders. That would make sense because multiple-vehicle crashes are usually caused by other motorists while single-vehicle crashes are usually the rider’s fault. To see if a discernible relationship exists between rider BAC and single-vehicle crashes, I queried NHTSA’s FARS database and plotted the percentage of riders involved in single-vehicle fatal crashes vs. BAC. The result, based on 12 years of data (1994-2005), is seen in the chart below.

    If we can assume that impairment is more likely to cause a single-vehicle crash than a multiple-vehicle crash, it’s clear that for motorcyclists, impairment begins at .01 and increases steadily with BAC. But why would that be? Physical impairment doesn’t start that low. Vision, balance, and motor skills aren’t affected until higher BAC. Judgment, however is a different story.

    You’ve probably been out drinking with a group where some guy gets brave after the first round and hits on the cocktail waitress. But other drinkers maintain decorum late into the night, even after their motor skills are woefully deteriorated. As I see it, that individual variation in judgment under the influence of alcohol accounts for the apparent low onset of impairment in the population. Motorcycle Cruiser magazine reported on an experiment that demonstrated the effect of judgment in Rolling Stoned (thanks for that, Cycle Art). Some subjects exhibited improved skills at low BAC but their judgment deteriorated early.

    The role of impaired judgment in spite of fully functional physical skills presents a problem in implementing the NAMS goal of reducing alcohol-related motorcycle crashes. It's easy to understand why you shouldn't ride if you can't see straight or keep the motorcycle upright. It's more difficult when you're full capable of controlling the bike but lack the good sense to ride safely.

    Impairment chart


    A superior rider uses superior judgment to avoid problems that would demand his superior skill.
  •  09-28-2006, 8:18 PM 74 in reply to 65

    Re: Impairment begins at .01

    DataDan,

    I don't know your line of work, but with my experience in law enforcement, most accidents occur when drivers/riders are either "under the influence" and/or speeding.  Notice I said most, not all.  You are right on in saying impairment begins at .01!  In looking at the graph, I tend to disagree or do not understand why there would be decrease in fatalities between .08 and .09 BAC.  Where did that chart come from?  Interested in knowing.  Thanks.

     

    Ride Safe,

     

    M. Wiggins  CA   Paradise

     

    "If it's predictable, it's preventable" 

  •  09-28-2006, 10:45 PM 75 in reply to 65

    Re: Impairment begins at .01

    In my humble opinion impairment begins long before the first drink. It begins in the thought process when we decide "To have a few" while riding or driving. It begins when we think "It cant happen here!", When we think "I wont get caught!" No one ever starts drinking and thinks that a crash will occur.

    Just understanding what happens when we drink, is a start to making the right decision.

    Personaly for myself I cant afford a DWI, because I pay in ways most people have no idea of. As a licensed boat Captain, with a DWI, my livlyhood is also at risk, a DWI goes against my Captains license as well as driving record.If I want to "tie one on" I usualy sit on the front porch or at a hotel, where it only involves stumbling back to the room. It all begins with choices, long before the first drink!

    Just my .02 worth

    NOGILLS2 


    NOGILLS2



    BMWMOA# 118213

    IBA# 25870

    Booze Brother# 69

    2003 K1200LTE "BEERBURNER"

    2006 Aluma Trailer "AFTERBURNER"



    "The less you expect.........."

    " The more pleased you will be!"
  •  09-29-2006, 8:37 AM 78 in reply to 74

    Re: Impairment begins at .01

    The data is from NHTSA's FARS database (link in original post), which has a record of every fatal crash in the US 1994-2005. The dip at .09 seems to be just random variation of no significance. Just one of those things that happens in the real world. All years/BAC levels show typical ups and downs, but at .09 the ups didn't fully balance out the downs.


    A superior rider uses superior judgment to avoid problems that would demand his superior skill.
  •  10-02-2006, 6:26 PM 127 in reply to 78

    Re: Impairment begins at .01

    OK, I'll take that answer for what it is.  I think the main thing is we all need to be careful and know the consequences. (Like we do not already know!)

     

    Be Safe,

     

    M. Wiggins   CA Paradise 

  •  10-03-2006, 6:36 PM 158 in reply to 65

    Re: Impairment begins at .01

    Imparement begins when the riders attitude is such that "I won't happen to me" or I can handle it. 

    This is usually reinforced by that rider making it 'home" and societal attitudes, peer pressure, fitting in, and the general somewhat macho, positive attitude some have toward drinking and riding in some "circles".

    Without using common sense and a general attitude adjustment, this is one factor which though being addressed will be difficult to totally eliminate. Rider eucation helps for the small percentage of riders taking advantage if it. 
  •  04-04-2007, 5:05 AM 481 in reply to 65

    Re: Impairment begins at .01

    There is no question that riding impaired increases your risk for injury while riding. So, let's do something about it. Go out to your clubs and local riding groups, and present the riding straight module form MSF. Anyone can teach it, you do not need to be an MSF instructor. They have done the work for us, invested the time and money, made the tools, we just need to get the tools, and use them. https://store.msf-usa.org/Store/MoreDetails.aspx?pid=137

    Riding Straight Module: To encourage motorcyclists to carry the message to other motorcyclists that the social activities of drinking and riding a motorcycle must remain separate, MSF is offering an $80 discount to the first 125 purchasers who are presenting to their riding club. The Riding Straight Module is a stand-alone product that can be used by anyone who is interested in helping motorcyclists make wise choices regarding drinking and riding, through education and prevention efforts. The Riding Straight Module is designed to allow facilitators maximum flexibility to develop the best activities to meet the needs and interests of a variety of audiences in a multitude of venues including riding clubs, high school demos and motorcycle events. A session can last from 15 minutes to 45 minutes. The Riding Straight Module contains a Facilitator's Guide, a 12-minute Riding Straight VHS Video, Fatal Vision Simulator Goggles, a roll of MSF floor tape and a CD with digital copy of the Facilitator's Guide.

    Maybe a local chapter could purchase it, and sponsor events where they teach it... Telling people "Don't drink when you ride" isnt going to work. We need to educate them, and then hope they use that information to decide for themselves that the risk is too great. I personally do not drink and ride. I am a mother of 2, and I feel the risk is too great. But that was a decision that I made. Obviously there are many riders that do not feel that way... but maybe if they had some more facts... but there is more to their decision to drink and ride than the facts...

    I mentioned in another thread on grassroots research, theat there should be a national online survey done, to assess self-report of attitudes and behaviors when motorcycling. I suggested that we ask in the survey, "Do you drink alcohol when riding?" (we would need to work on the wording, but you get the idea)... If they do answer yes, I think they should be given an extra set of questions, that address their attitudes towards drinking. We need to collect the data to find out what are the riders that are drinking thinking, and then address that further.

    My understanding of this forum is to get us together, so we can DO something. So, let's get involved and do something. Petition your riding club or group to purchase this training module, or one similar to it (Does ABATE offer something similar? Does anyone know?) and go out into the motorcycling community and spread the word... And we don't want to go out there in an accusatory fashion... it is all in the approach... We want our fellow riders to know that we care about them, and their lives are valued to us, and that's why we are there to talk about riding straight. Because that is why we are here. To save lives.

    Thanks- Laura

     


    "The destination is only the excuse" - Daniel Meyer
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