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Rude Drivers Reduce Traffic Jams
BuzzSkyline writes "Traffic jams are minimized if a significant fraction of drivers break the rules by doing things like passing on the wrong side or changing lanes too close to an intersection. The insight comes from a cellular automata study published this month in the journal Physical Review E. In effect, people who disregard the rules help to break up the groups that form as rule-followers clump together. The risk of jamming is lower if all people obey the rules than if they all disobey them, according to the analysis, but jamming risk is lowest when about 40 percent of people drive like jerks."
especially on the Belt Parkway where people seem to slow down to 30mph to go over a bridge
"Breaking the rules" is not rude behavior on the road, as far as I'm concerned. Most of the problems on our highways are caused by people driving 'below' the rules. Some examples are failing to accelerate to highway speed on the onramp, driving in the 'passing' lane when you aren't passing anyone, and my personal least favorite, not being ready to go when the light turns green at a crowded rush hour intersection. If no-one made these key mistakes our highways would probably be able to accomodate 20% more traffic without any physical upgrades in capacity. yet somehow, I'm the bad guy for flashing my lights at some jerk driving 55 right next to someone else going 55 when there are 15 cars stacked up behind him!
The risk of jamming is lower if all people obey the rules than if they all disobey them
I beg to differ, compression waves in traffic form even when everyone obeys traffic http://www.3quarksdaily.com/3quarksdaily/2008/03/shockwave-traff.html
Once in traffic if you drive slowly avoiding the urge to speed up when a gap forms you can actually help everyone behind you have a more pleasant cruise.
I think they did.
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As somebody has already mentioned in the comment on PhysicsCentral, a realistic model should take into account the dependence between the probability of causing an accident resulting in a traffic jam and the driving style. I could read only the abstract. If the parameter q is the only parameter used, it is not entirely surprising that they got the results they got. In such a model, the rule-obeying drivers driving in the same direction stick together. Rule non-obedience makes the fluid more compressible. Shock waves in compressible fluids appears at higher velocities. It is surely nice their model agrees with the intuition. I would not call such a simplified model realistic, though.
The other day, a person was changing their tire on the shoulder of the road facing the opposite direction (was a 4-lane road, 2 lanes in each direction, separated by a 20 foot or so median) and traffic on my side of the road came to a halt. Once I made it to the front of the line of traffic, in the lane (going the opposite direction) nearest the tire-changer, a car in the lane next to me and slightly ahead of me was gawking at the scene so hard they started drifting HARD into my lane. They were completely mesmerized by someone changing a frigging tire. To the point that they weren't even conscious that they were still driving a car.
I swear I don't get it. I had to blare my horn at them to get them to get back over into their lane, and they had the temerity to flip me off! Luckily for me, I drive a large truck and was able to pull in front of them at the next light where I stopped, put on my hazards, drug them from their car and threw them into traffic. No, of course I didn't. However, it's interesting how rage-filled we people get in traffic. I am trying to get it under control, but cannot abide selfish, stupid unaware drivers. I hate them with a burning passion.
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I know I slow down when people tailgate me very badly (within a meter), and speed up again when they change lanes. It's a guilty pleasure.
Honestly, it's the only safe thing to me do. If I have someone driving that close behind me I'll need more time to brake if something happens up ahead, to prevent the person behind me ramming into me.
Give me space, and we'll go a nice fast speed. I'll be happy to let you pass me and will move to the right. Ride my ass and expect to go under the limit.
You've pegged Atlanta. Here, people tend to be somewhat nice drivers. (As opposed to, for example, New York City, where they are horrible mean.) But very, very fast on the highways.
And, for some totally inexplicably reason, the Downtown Connector has a frickin speed limit of 55, so people are constantly going about 20 over, or about 10 over what it should be. (The greatest stunt ever.)
For those of you who don't know what the Connector is, that's where I-75 and I-85, the main north-south roads, merge into one giant superroad. 16 lanes of traffic in some places, 300,000+ cars a day.
All going 80 miles an hour. Down a road that doesn't have a medium, or a shoulder half the time. (The road essentially goes underneath the city streets, straight through both Downtown and Midtown, with walls down the side and buildings on top of them looming over the road.)
OTOH, people will, in fact, let you into traffic on the surface streets, and not attempt to wedge their car up your ass or cut you off.
If corporations are people, aren't stockholders guilty of slavery?
In some places, lane splitting is legal.
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As an FYI not all states require the passing lane to be "yeilded" so long as you are going the speed limit. This is the case I believe in MD as well as NC, among others. If the speed limit is 65 and and both lanes have people next to each other going 65, get over it, no law is being broken.
And if the speed limit is 65, and I'm in the left lane going 75, and you come up on my ass flashing lights trying to get me to move over, you will get ignored. I don't give a shit if you want to go 85 in a 65 like 30% of the other drivers, the limit is 65 and I'm already going 75. I'm not going to move into the right lane and get stuck behind someone going 55, unable to change lanes because everyone on my left is going 25-30mph faster than me.
the safe thing to do is you should have already switched lanes (if you're in the left that is) by the time they got to you if you see them coming up.
This isn't always possible. Often, there are people in the right hand lane going 70-75 mph and passing the speed limiters in the left lane who are traveling 65 mph. Just because you want to go 85 mph doesn't mean the slower motorists should automatically bow to your speedy abilities. This would, in my opinion, mean that *you* are driving like an asshole.
This is *most* evident when two tractor trailers are passing each other on a major two or three lane highway. But basic congestion causes it too... and whenever you drive like an asshole when there is already congestion... you are only going to make it worse.
Corollary: I've always thought cops should actively seek to give tickets to motorists who get passed on the left by drivers who are traveling at a legal speed limit. That behavior is just a dangerous as the asshole who weaves in and out of traffic. So, slow drivers in right-hand and middle lanes are assholes, too.
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I've always wanted a law that billed people who cause accidents on major freeways (or their estates, as the case may be) the average hourly wage for that state multiplied by the number of total hours lost due to their actions. For example, if some asshole gets into a fender bender on 95 because he was fucking with his goddammed cell phone and 10,000 people are delayed for an hour and the average wage in Maryland is $17/hour then he (or his estate) owes $170,000 which can then be used to fund hypertension treatment facilities and meditation centers in the state.
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I think the jury is still out on whether its safe or not - and most evidence so far suggests its actually safer. I know if traffic is crawling along it seems safe enough to me - the biggest problem is being cut off by arse holes who are pissed off you're filtering through traffic despite the fact they are sitting there.
http://en.wikipedia.org/wiki/Lane_splitting#Relevant_research
I know in the UK you can only do it when traffic is flowing below a certain speed, and that they ask you questions about it if you are getting a regular drivers license (yes - hard to believe they'd want drivers of cars to be aware of motorcycles) - of course license requirements there are much much more stringent than they are in the USA.
Thing is - on a hot day sitting on a hot bike in full gear (its like wearing your fur coat to the beach...) not moving can be really miserable. It can contribute to fatigue, bike failure - all kinds of stuff that I would figure would be more dangerous to traffic than filtering.
The cry "Correlation != causation" is now the official Slashdot signal for someone who doesn't know what they're talking about, and probably didn't read the article.
(1) This research is done on a computer model of each possible behavior. It's a designed experiment. Neil A. Weiss, Introductory Statistics p. 22: "In a designed experiment, researchers impose treatments and controls and then observe charactersitics and take measurements. Observational studies can reveal only association, whereas designed experiments can help establish causation." (Emphasis his.)
(2) The issue of slack between cars is not overlooked, it's *included as a major component of the reasearch*. FTA: "However, there is one rule you shouldn't break, according to a new analysis of how high-volume traffic flows along a highway. Cecile Appert-Rolland, a physicist at the University of Paris-Sud, looked at the tailing distances between cars traveling on a busy two-lane expressway in the suburbs of Paris. Most people have heard of the 'three-second rule' for following distances; after the car ahead of you passes a point on the road, count to three. If you pass the same object before you get to three, you're following too closely...
We know where leadership by an anti-intellectual "strongman" who scapegoats minorities and likes boisterous rallies goes
1. "hypermilers" who don't understand lights are timed for the speed limit, and if you don't get up to speed in a reasonable amount of time, you're just going to waste all that gas at red lights.
2. During rush hour, the problem on "surface" streets is that lights can't be long enough to allow everyone to go through during the green light, so those people just sitting there when the light turns green are racking up the number of cars that are going to get stuck for an extra cycle... but the problem, as I see it, is people have largely stopped honking, so they'll just sit behind such an oblivious person and just wait. If people honked, we could get things moving again. It doesn't have to be a nasty lean on the horn, just a toot-toot.
And lately, the past year or so, I wouldn't necessarily call them "hypermilers" but so many people seem unwilling to even get up to the speed limit, let alone exceed it by a few miles per hour, as if you're going to get a ticket for 48 in a 45... I know the police aren't going to give me a ticket for 5 miles over, and I often get passed by cops when doing so.
He's a thing I do: When the light in front of me turns red, I get my foot off the gas, and I let the car decelerate towards the red light.
When I'm in the zone, I pretty much don't stop at red lights because they have the time to turn back to green before I get to them.
Now, here's the problem with that: The masses of idiots who are in a fucking hurry to go park on the red. They cut me off, and then I have to stop behind them while I wait for them to start up again when the light turns green. Some of them are salvageable, as after seeing me do my thing for a few lights they understand the principle and start laying off the gas when they see the next red, some are not, and insist on cutting me off and, I dunno... win the street race going on in their demented little heads. First one wasting gas and brake lining wins! Woo!
Anyway, leadfoot, remember that red lights mean "stop accelerating", not "this is the finish line to the race, quick, get here before anybody else" :)
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I take issue whatever study showed that waiting until the last minute is more efficient. You've got 1 lane of traffic, and for any given speed that lane travels at, you can only get a certain flow rate of cars through that bottleneck, no matter if it's 1 lane feeding it, 2 lanes, or 100 lanes. Well, if you wait until the last minute to merge, you end up with cars tighter together, which means the tolerance for merging is a lot smaller. This would be perfectly fine if everything were computer controlled, but since we've got human with emotions involved, you end up with people having to slow down to merge more carefully. But see, by slowing down, you've just decreased the speed of the lane, so fewer cars are going to make it through in a given time. On the other hand, if you merge early, vehicles will not yet have moved into a tighter formation, so you can more comfortably merge into a single lane without having to slow down as much. You can maintain a higher overall speed, and thus get a higher flow rate through the bottleneck. However, even if you can merge together at the last minute without slowing down, at best you get the same flow rate as if everyone had merged early, so in what way is merging late better?
Of course, we are talking theoretically here. As soon as the one idiot gets greedy and waits until the end, you lose that benefit as everyone has to slow down anyway. However, that's where proper enforcement can come into play. Start ticketing people and they'll learn. Then again, you start ticketing people and that just compounds the problem as people start slowing down..."oh my god, it's a police officer....and he's writing a ticket....slow...down...I've...never...seen...that...before". I guess the only way to make it work right is to go vigilante and start blocking the lane, but then that opens up a whole different can of worms. I guess you can't win.
Also, on this topic, I find it interesting to see how people in different areas behave. Here in Michigan, you will almost always see people waiting until the last minute to merge. A few years ago we went down the the Smokies/Blue Ridge Parkway. On the way back, we were in Virginia (or maybe West Virginia). There was construction at a tunnel, and we were merged into one lane. There was nobody waiting until the last minute to merge. I looked back in the mirror, and for as far as I could see (at least a half mile), there was just a single line of cars and an empty lane.