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Magic Roundabout (Swindon)

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Re: Magic Roundabout (Swindon)

#111
post #43

A better solution for high traffic flow is the turbo roundabout[0] which is getting increasingly popular in Netherland. Before you enter the roundabout, you select the lane for the direction you want to go. You only cross traffic when entering the roundabout for the first time. After that, you simply follow your lane and it delivery you where you want to go. It looks complicated from above, but it's very simple once…

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Re: Magic Roundabout (Swindon)

#112
post #43

A better solution for high traffic flow is the turbo roundabout[0] which is getting increasingly popular in Netherland. Before you enter the roundabout, you select the lane for the direction you want to go. You only cross traffic when entering the roundabout for the first time. After that, you simply follow your lane and it delivery you where you want to go. It looks complicated from above, but it's very simple once…

I don't understand how the turbo roundabout is any different than a typical two-lane roundabout. It looks like a regular two-lane roundabout from that picture in your link.

On a plain 2-lane roundabout when you're driving the outside lane you are not forced to leave it at the 2nd exit.

Sometimes there are even no signs/arrows on the road that require you to do it. It is expected of you, but if you happen to be one of the drivers that suddenly change their minds or you don't know how to drive on roundabouts you could continue driving around in the outside lane.

So a typical situation which makes roundabouts dangerous is when you're driving in the inside lane and you want to take the second exit (on a 4-exit roundabout that's going straight). If a driver next to you (in the outside lane) carries on driving until the third exit, they'll crash into you.

If it happens to you in Poland the situation even more stressful, because according to law, you are (partly) the responsible party, because you were the one who changed lanes!

IMHO, that's why turbine roundabouts are a great idea. Too bad that there aren't many of those or they are implemented incorrectly. See [0]. The outside lane ends in only 2 of 4 exits. Is it 50% safer though?

[0] https://www.google.com/maps/@52.2547072,20.9822988,188m/data...

Re: Magic Roundabout (Swindon)

#113
post #43

A better solution for high traffic flow is the turbo roundabout[0] which is getting increasingly popular in Netherland. Before you enter the roundabout, you select the lane for the direction you want to go. You only cross traffic when entering the roundabout for the first time. After that, you simply follow your lane and it delivery you where you want to go. It looks complicated from above, but it's very simple once…

We don't have many, and the few we do are pretty new, but several of the roundabouts near me in the US work like this.

Re: Magic Roundabout (Swindon)

#114

I first drove this back in the early 90s when I happened to be near Swindon (for some training), and a friend (who often worked in the area) had told me about it, so I deliberately went to it. Bear in mind this is pre-common-internet use era, so everything was hearsay and so on... He told me it was a 'nightmare', and 'weird' and so on. I was actually pretty underwhelmed when I drove it - it seemed really logical to m…

I think it's because it's locally simple. At each decision point the rules are no different to normal roads and it's easy. It may look complex globally, but yeah then don't try to do that.

Re: Magic Roundabout (Swindon)

#115
post #65
post #57

Hanger Lane Gyratory System - the most frightening roundabout in the UK (or possibly anywhere) - https://www.mylondon.news/news/west-london-news/ealings-noto...

Having commuted through it every day for 2.5 years, I’m genuinely not sure what the fuss is about. It’s just a big roundabout. (And while this isn’t a pure positive!) if you were unsure, it was usually so slow moving you had plenty of time to figure out what to do. The only disturbing aspect it brought to my life wasn’t navigation stress, but rather its unpredictable effect on my commute. :)

> if you were unsure, it was usually so slow moving you had plenty of time to figure out what to do.

I don't drive, so I wasn't unsure, just terrified, as you would be if you being driven round it by my then girlfriend, who combined the driving skills of a rally driver with the mentality of Mr Toad from Wind In The Willows.

Re: Magic Roundabout (Swindon)

#116
post #83

I guess what this shows is two things: 1. Scaring people into slowing down is a viable way to avoid accidents. 2. Perceived scariness of an intersection is not indicative of how dangerous it actually is.

RE: #2 Absolutely. Within Saskatchewan, east of Regina, we just completed three new bridges for suburban communities to access the main highway. In two of the three bridges were atypical designs using a Diverging Diamond at one point, and dual roundabouts at the other. When announced lots of people were fearful of the new designs and there was unsurprisingly a lot of outcry from ninnies who were afraid of the unknown…

Another example of this is the downtown area of a small PA town I stopped in recently. They had recently re-paved the entire center street with brick and stone. The sidewalks were wide and there were no curbs, only rubber-covered metal posts marking the boundary between car and pedestrian areas. As a driver, I found this design scary, because it was hard to visually see where I should be driving. But I noticed that the natural result of this was that I drove around 15mph despite signs coming into the town saying 25mph as the speed limit. Another cause of this is that the sound of bricks under your tires gives the impression that you're going faster than you actually are. It was scary, but it put my focus as a driver on not hitting pedestrians, poles, or other cars, rather than slavishly following lines and curbs. Not hitting pedestrians, poles, and other cars is the entire point of the lines and curbs, so it's a more direct way to solve the problem.

I think the fear aspect comes from the fact that hitting a pedestrian seemed like a real possibility the entire time I was in the town. But that fear is rational: there is a real possibility of hitting a pedestrian, and a high-foot-traffic area shouldn't be designed to assuage that rational fear. Drivers should be afraid of hitting pedestrians.

A placard commemorating the redesign in the town square said that since the redesign in 2017, car/pedestrian accidents dropped from 279 to 43.

* I'm citing numbers and locations from memory here so take this all with a grain of salt. I only stopped in the town for lunch on a long drive, so I don't remember all the details. My memory for numbers is usually good, but is not infallible.

Re: Magic Roundabout (Swindon)

#117
post #43

A better solution for high traffic flow is the turbo roundabout[0] which is getting increasingly popular in Netherland. Before you enter the roundabout, you select the lane for the direction you want to go. You only cross traffic when entering the roundabout for the first time. After that, you simply follow your lane and it delivery you where you want to go. It looks complicated from above, but it's very simple once…

Might be wrong, but I remember this existing (albeit with traffic lights) in the 90s near Amsterdam Amstel Station.

Re: Magic Roundabout (Swindon)

#118
post #99

Earlier quoted context omitted.

In a traditional 2 lane roundabout you aren't forced out of the roundabout. An example would be https://www.google.com/maps/@39.9561738,-86.1623079,150a,35y...

Are you just talking about being able to make a lane change within the roundabout? Because the outer lane cannot take the third exit in your example (at least according to the lane markings), they must exit before then. In Ontario anyway, the general rule for roundabouts is that you aren't allowed to make lane changes, though they still use a dotted line so as to not make you think you're prevented from entering the…

On these "turbo roundabouts" there are also kerbstones between the lanes, not just lines. You can cross them but it'll be obvious that was not the intended use.

I hate driving them. Somehow every one I drive on seems massively overengineered, and could have been done with a completely normal single lane roundabout. But it's usually not rush hour when I drive there.

Re: Magic Roundabout (Swindon)

#119

I guess what this shows is two things: 1. Scaring people into slowing down is a viable way to avoid accidents. 2. Perceived scariness of an intersection is not indicative of how dangerous it actually is.

Aren't those ideas the underlying premise of shared streets (woonerfs)? Basically remove as many signs, markings and kerbs as possible so there's no segregation, and usually break up vision lines. The driver uncertainty stops traffic being the dominant user.

Result lower accidents, much lower speeds, and above all safer cyclists, pedestrians and any kids playing.

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