View Poll Results: Do you think cars should have built-in electronic speed limit

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    93 80.17%
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Thread: Should cars have built-in speed limit?

  1. #301
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    Re: Should cars have built-in speed limit?

    Quote Originally Posted by Phys251 View Post
    That's not necessarily true and I can prove it. Here is a counterexample. Quote:

    "GDOT officials are considering raising the speed limit to 70 in urban areas - or places with populations of 50,000 or more. The agency raised the speed limit to 65 mph along a 27-mile stretch of I-285 in November. Department records show that drivers traveled at 65.4 mph after the limit was raised, compared with 65.5 mph from before. The limit had been 55 mph."

    My preliminary research suggests that raising speed limits on interstates, particularly rural interstates, can be a reasonable course of action (PDF). But raising speed limits on surface streets is not:

    The results of the model estimations showed that, for the speed limit ranges currently used, speed limits did not have a statistically significant effect on the severity of accidents on Interstate highways. However, for some non-Interstate highways, higher speed limits were found to be associated with higher accident severities, suggesting that
    future speed limit changes, on non-Interstate highways in particular, need to be carefully assessed on a case-by-case basis.
    That doesn't prove anything since we don't know what stretch of road they're talking about or what it looks like. I specifically said "unless the road is obviously hazardous at those higher speeds". For example, few people will drive 80 MPH on a hilly 2-lane even if the speed limit is set to 90 MPH. Most drivers have at least some sense of what's safe and what isn't. Since the average speed driven didn't change in this case, that tells me the State finally got the speed limit right. It in no way implies that all or even most interstates are signed correctly or that higher posted limits won't result in higher average speeds.


    It all depends on what the limit was before the change. I can certainly show that 55 MPH was safer than the (mish-mash but) higher speed limits we have now. That's ancient history at this point. The percent of speeders was higher at 55 (because drivers knew it was low-balled) but the fatality rate was lower.


    PS
    A survey of Indiana drivers in the fall of 2005 (a few months after Indiana Interstate speed limits were raised) found that under free-flow conditions, drivers reported driving an average of nearly 11 mph over a 55-mph Interstate speed limit, about 9 mph over a 65-mph Interstate speed limit, and less than 8 mph over a 70-mph speed limit (27).
    Your own study proves my case. Average speeds all of them over the speed limit went up with higher speed limits:

    55/66
    65/74
    70/77
    Last edited by MoSurveyor; 01-31-14 at 04:45 AM.
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  2. #302
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    Re: Should cars have built-in speed limit?

    Quote Originally Posted by DVSentinel View Post
    Enjoy the read. But I am not going re-address points already made. Or don't and just let everyone know that you are only interested in being antagonistic and don't really have a point to make.
    I'm not. I'm simply asking for a post number, because I don't feel like searching through nearly 300 posts. Or are you bluffing?
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  3. #303
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    Re: Should cars have built-in speed limit?

    Quote Originally Posted by MoSurveyor View Post
    That doesn't prove anything since we don't know what stretch of road they're talking about or what it looks like. I specifically said "unless the road is obviously hazardous at those higher speeds". For example, few people will drive 80 MPH on a hilly 2-lane even if the speed limit is set to 90 MPH. Most drivers have at least some sense of what's safe and what isn't. Since the average speed driven didn't change in this case, that tells me the State finally got the speed limit right. It in no way implies that all or even most interstates are signed correctly or that higher posted limits won't result in higher average speeds.
    I don't think it has much at all to do with what drivers perceive as safe. If they can show me that they can solve complicated physics equations in their head, in like, three seconds, then maybe I'll believe the line that an individual inherently knows what's safe on the road. The bottom line is that the maximum safe speed, whatever it may be, is a result of a mathematical function, not a personal perception.

    It all depends on what the limit was before the change. I can certainly show that 55 MPH was safer than the (mish-mash but) higher speed limits we have now. That's ancient history at this point. The percent of speeders was higher at 55 (because drivers knew it was low-balled) but the fatality rate was lower.
    That makes sense. People, some in particular, don't want to admit that in general, slower driving = safer driving. The notion that it's the speed differential and not the aggregate speed is a myth. But the trick is to find the right balance between safety and speed.

    PS
    Your own study proves my case. Average speeds all of them over the speed limit went up with higher speed limits:

    55/66
    65/74
    70/77
    Different strokes for different folks. If that turns out to be the dominant trend, then that is a reason to keep highway speed limits LOW and enforce them hard.
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    Re: Should cars have built-in speed limit?

    Quote Originally Posted by jmotivator View Post
    An Experiment: Push the gas pedal all the way down while you are on the highway... I would suggest you will find your car already has a speed limit.
    Any tech data to support that? Short of just not going any faster most cars to not have a top speed limiter.

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    Re: Should cars have built-in speed limit?

    How about we just ban cars altogether. No cars, no car deaths.

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    Re: Should cars have built-in speed limit?

    Quote Originally Posted by Phys251 View Post
    I'm not. I'm simply asking for a post number, because I don't feel like searching through nearly 300 posts. Or are you bluffing?
    No, not bluffing. You want me to give you that information because you don't want to go back and read the post. Well, I would have to go back and reread them to get that information. I don't want to do that.
    Only a fool measures equality by results and not opportunities.

  7. #307
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    Re: Should cars have built-in speed limit?

    Quote Originally Posted by CRUE CAB View Post
    Any tech data to support that? Short of just not going any faster most cars to not have a top speed limiter.
    First, lighten up, it's a joke..

    Secondly, it is simple physics. As a car increases in speed the wind resistance pressing in the opposite direction also increases. When the wind resistance equals the car's power output (/w gravity assist) the car will stop accelerating and reach it's speed limit.
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    Re: Should cars have built-in speed limit?

    Quote Originally Posted by jmotivator View Post
    First, lighten up, it's a joke..

    Secondly, it is simple physics. As a car increases in speed the wind resistance pressing in the opposite direction also increases. When the wind resistance equals the car's power output (/w gravity assist) the car will stop accelerating and reach it's speed limit.
    Drag, not wind resistance is the greater force.
    Only a fool measures equality by results and not opportunities.

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    Re: Should cars have built-in speed limit?

    Quote Originally Posted by DVSentinel View Post
    Drag, not wind resistance is the greater force.
    Yeah, sorry for the careless post. Either way, the joke has been officially killed via analysis.
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    Re: Should cars have built-in speed limit?

    Quote Originally Posted by DVSentinel View Post
    No, not bluffing. You want me to give you that information because you don't want to go back and read the post. Well, I would have to go back and reread them to get that information. I don't want to do that.
    Exactly what I thought. You have nothing. Next!
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