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Old 25 August 2015, 01:52 PM
A Turtle Named Mack's Avatar
A Turtle Named Mack A Turtle Named Mack is offline
 
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Driver You might be wrong about roundabouts

Misconceptions about roundabouts – circular intersections that are cropping up all over Georgia — abound with regard to everything from how they work, to how safe they are, to what they cost. Georgia Department of Transportation has a good instructional video on roundabouts. And with the help of Scott E. Zehngraff, assistant state traffic engineer, we can now dispel some of the myths about them.

http://commuting.blog.ajc.com/2015/0...t-roundabouts/
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Old 25 August 2015, 02:05 PM
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Darth Credence Darth Credence is offline
 
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I have a definite love/hate relationship with roundabouts. I love them, but hate the fact that the people here just can't quite seem to understand them. There is one near my house that works great on the occasional times that everyone understands them. Most of the time, there are a few people who just don't get the concept, and end up stopping and shutting down the whole thing. This has been going on for years.
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Old 25 August 2015, 02:35 PM
dfresh dfresh is offline
 
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I grew up with them, and they generally work very well, but yeah some people just do NOT get the idea. An intersection near my house is being upgraded from a two way stop, and it is supposed to be upgraded to a round-about, but some people are pushing for a four-way stop. I so hope that it doesn't go to a four-way stop since most times, there is no one at the north-south part of the intersection, but we'd have to stop anyway just because if there are stop signs.
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Old 25 August 2015, 03:25 PM
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Our county is starting to use roundabouts. The first major one was installed just off the interstate in Venice (thanks for experimenting on us, county commissioners). After five years drivers are still struggling with how they are to be used. Throw in drivers just getting off the interstate that have never used a roundabout and you have a recipe for disaster. They may reduce serious accidents, but this roundabout has more accidents in one year than the most dangerous signaled intersection in the county. This despite the fact that many locals go out of their way to avoid this roundabout.

In fact we had a guy that was cited for an accident in it and fought the ticket. He brought experts in to explain that he was in fact using the roundabout correctly and that the other driver was in the wrong. The judge agreed and was about to throw out the ticket when the Florida Highway Patrol (FPL) raised an objection. The official FPL interpretation of how traffic should move through the roundabout was in direct opposition to the experts. After some discussion lane markings were changed, new signs put in place and the FPL changed their way of determining who was at fault. Oh, yeah, the guy did get out of his ticket.

Venice Roundabout: Worst Intersection in Sarasota County?
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Old 25 August 2015, 03:32 PM
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amorrison50 amorrison50 is offline
 
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We got one a few years ago. It works pretty well part of the year, but considering that it's at the highway exit to the university which means we have a large crop of new people (students and parents) every year who don't know how to use it, it's probably not the best placement for one. Add in all the people who come in for games and such and you constantly have people with no clue what they are doing.
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Old 25 August 2015, 03:50 PM
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Beachlife! Beachlife! is offline
 
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They put quite a few of them into my neighborhood. They work well and seem to improve flow in both directions at low traffic intersections.

They installed one downtown which is inside of a four way stop. I'm not sure what that does that is an improvement. It seems to slow things down and create confusion more than anything.
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Old 25 August 2015, 03:55 PM
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crocoduck_hunter crocoduck_hunter is offline
 
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There was a roundabout that was used to replace a stop light in a city I frequent.

The real problem is that whoever designed it went way overboard on putting in plants around it, so it actually has worse visibility.
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Old 26 August 2015, 06:38 AM
Troberg Troberg is offline
 
 
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Roundabouts are the second most effective intersection, after the height separated intersections (probably not the correct English term, but I mean the ones with an overpass and ramps). They are also extremely safe, very few dangerous accidents happen, as everybody is going more or less in the same direction, so most accidents just becomes fender benders (motorcycles excepted, but they are dangerous in just about any situation, and a roundabout still is better than other solutions for them).

My main problems with them are:

* In the winter (or, as I've experienced, when there is a fountain in the center and some idiot put soap in it, creating a mountain of bubbles which leaked onto the road), when it's slippery, it's easy to lose control.
* Occasionally, trucks tips over. Seen it once, scary as hell to see. By coincident, 20 years later, I talked to a guy who I found out was the guy in the truck. Scary as hell for him as well...
* Long trucks and buses sometimes have problems with smaller roundabouts.
* If you floor it on the way out of the roundabout, you'll wear out your front wheel bearings a lot faster.

Still, these are minor flaws, and the roundabout is still a darn good construction.

Quote:
Originally Posted by Photo Bob View Post
In fact we had a guy that was cited for an accident in it and fought the ticket. He brought experts in to explain that he was in fact using the roundabout correctly and that the other driver was in the wrong. The judge agreed and was about to throw out the ticket when the Florida Highway Patrol (FPL) raised an objection. The official FPL interpretation of how traffic should move through the roundabout was in direct opposition to the experts. After some discussion lane markings were changed, new signs put in place and the FPL changed their way of determining who was at fault. Oh, yeah, the guy did get out of his ticket.
We have that problem in Sweden as well. The police is currently having a drive where they ticket people who don't give directions properly in roundabout. The problem is that the police is not interpreting the law correctly (and I won't even go into the fact that it's not the role of the police to interpret laws anyway, that's up to the Courts), so the tickets are all wrong.

Basically, the police wants you to signal right when leaving a roundabout. However, the law does not require this, and it can lead to dangerous misunderstandings.

What the law say on the subject is very little, so one has to go back to general rules for signaling. Among them is the rule that if you have no choice of where to go, you don't have to signal. For example, if you come to a T-crossing, entering from the vertical leg, and the horizontal leg is a one way street, you don't have to signal, as you can only go in one direction.

With roundabouts, this gives several options (all assuming a 4-way intersection):

* Single lane roundabout. Signal when exiting right or straight. No need to signal when exiting left, as you no longer have a choice of where to go.
* Dual lane roundabout, outer lane. Signal when exiting right. No need to signal when exiting straight, as there is no choice of path.
* Dual lane roundabout, inner lane. Signal when exiting straight, no need to signal when exiting left, as there is no choice.

Basically, see it as a straight road with one (two if single lane) T-intesections and a turn at the end. That makes it clearer. Then bend that straight road to the correct shape. The same rules still applies.

To further confuse the issue, there are also intersections which looks like a roundabout, but are not marked with the sign for a roundabout (the three circulating arrows). These may look like a roundabout, but legally, they are ordinary intersection, but with a large refuge in the center. This makes for some very confusing, and potentially dangerous misunderstandings:

* Vehicles outside the intersection has right of way, as the right hand rule applies (unless signs say otherwise, of course). This is exactly the opposite of a roundabout, where vehicles inside the roundabout have tight of way.
* Signalling is done as in an ordinary intersection. In other words, all the way through, you signal the direction you are going to exit, so signal left for left, right for right, and no signal for straight.

Now, this is not all, as there are some commom behaviors that mess things up, based on the confusion between to two types. Even driving schools mess this up. This means that many people signal which way they are going when entering, and then signal right when exiting (regardless of direction).

As you can see, with all these variants floating around, signalling becomes undistinct to the point of meaninglessness. You can never rely on a certain meaning for a signal, because you don't know which model the driver follows. And, on top of that, the police add to the confusion by ticketing drivers for perfectly legal driving and giving the wrong guidelines. Even more conflicting variants are given by the road administration (which, by the way, like the police, aren't the correct instance for interpreting laws).

All in all, signalling in roundabouts and roundabout-like intersections is a mess in Sweden.
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