In the US (at least in the Boston area) it's another matter, and it's almost as if people just don't know what they're doing, and after doing my driving test here I'd believe it. :)
If you want to exit after 90 degrees, outer lane. If you want to exit after 180 degrees (straight through), either lane. If you want to exit after 270 degress, inner lane at first, then start indicating you are exiting, perhaps moving to outer lane before exit. The latter sounds confusing, in practice it isn't, mainly because other people will be expecting it.
My confusion about the multi-lane roundabout mostly stems from the scenario where two cars, entering from streets 90* in the direction of the flow apart, both want to go straight through. If the one entering 'upstream' takes the inner lane and the one 'downstream' takes the outer lane, it would seem that in some timing conditions you'd get a collision situation when the inner lane car tries to exit but must cross the outer lane to do so. Is this a practical concern? Is there a universal set order of precedence for this case, e.g. inner lane always yields if necessary?
In places I've driven where there might be confusion, they mark the lanes with arrows to show which ones are exiting and when.
They work pretty seamlessly in my experience. You only have to look one way (upstream), instead of two, to judge whether to enter the intersection, and you don't have the time-waste of traffic lights.
However, I think the magic roundabout can wait until the next generation...
It's a triple roundabout with a highway bridge separating two of them. The internals are arguably simpler but there are more entrances/exits than the magic roundabout.
For bonus points, check out what state this is in.
(I use Bing because last I checked Google still doesn't have a good satellite view of this, despite it being several years old now.)
You have to make a left by basically taking almost like a freeway ramp off to the right.
If you miss your left turn ramp on the right in some parts of Jersey, you end up driving many miles to get another opportunity due to all the Jersey barriers that basically prevent real left-hand turns.
The system is clearly more efficient if you know exactly where you are going - it's an expert system. Which also implies it's unforgiving to people unfamiliar with it. (As in, me.)
More recently, Google maps at one point had a routing bug that caused it to propose a 360-degree double U-turn at every intersection while traveling along US 1, which in practice would result in the same maneuver.
Also, forcing people to drive an extra 3-4 miles because they missed a turn is probably not very good for the environment. Just sayin'
Compared to damage of burning up a few cars every few months in accidents? Just sayin'
Looking at YOU Brick, NJ! >:/
This is a very bad idea.
I'm not a fan of Michigan zoning whatsoever, but in this case, the damage is done with or without the Michigan Left.
Every new boulevard is divided because metro Detroit zoning boards design in favor of car use in almost all things. The huge parking lots, the divided neighborhoods, the laughable sidewalk situation -- it's all because optimizing car flow is the priority.
The symptoms aren't the problem.
I brought up 8 mile as an example but Woodward is just as bad dividing the white people in Royal Oak from the white people in Berkeley.
You can't walk across the street with those huge boulevards. That's the point.
Saying that the "Michigan Left" is the cause isn't exactly correct, but it does allude to the overall nature of the layout.
Don't get me wrong, I really love Detroit but its city planning is a huge contributor to its most pressing issues.
Visit Detroit though. It's possibly the most interesting place in the world.
Usually twice a day, always good. (Not my site, btw)
The driving practice of the first left-turning vehicle taking precedence over vehicles going straight through an intersection.
Another odd Pittsburgh-ism that has its own Wikipedia page: http://en.wikipedia.org/wiki/Pittsburgh_parking_chair I'm not a big fan of this one.
The Michigan turn takes roughly half of these, the 4 left turn modalities and 4 u-turn modalities and displaces each of 4 to a location where it only affects a single direction, the oncoming one, although it has the side effect of doubling the number of right hand turns at the main intersection, but these are safer turns than left ones.
A variation on this I have seen on highways and interstates throughout the US is to have a left turn slow down and two-way median turn around lane that is in between the actual roads where one would turn, ensuring that no dangerous left turns take place. The left turn is replaced with a u turn which is even more dangerous due to the lower speed at which one clears oncoming traffic, and there are seldom any pedestrian situations since pedestrians aren't usually found on highways. But it does avoid the otherwise conflict with negotiating the crossing with several other directions at once, to your right cross traffic, left cross traffic, left across-left turn traffic, right across-left turn traffic, and oncoming traffic, reducing all this to having to deal with oncoming traffic only.
And if I had not read this link I never would have thought about all this stuff, so thanks for posting.
we do this all the time, just didn't call it anyway.
the next time i collide, i'll come out and say, "i gave you a signal, i was making the Pittsburgh left, you uneducated moron!"
Miss the first light to cross straight through the intersection. Idle.
Queue into the non-intersection left turn lane to cross two lanes of oncoming traffic. Idle.
Wait for a right turn red light and idle, or wait for an opportunity to merge into two lanes of oncoming traffic and idle.
The best case scenario is light traffic and hitting both lights green, but you're still going further and taking longer to accomplish a left turn signal's best case scenario. A double left turn lane with signal is almost always faster in my experience.
- A Michigander
Maybe they are more of a small/medium sized city feature, but it was hard coming back to California and all it's stop lights and stupid turn lanes.
When I first landed - it was almost frightening to drive -the flashy noisy cop cars, the humongous, wide, structured yet confusing mingling of roads. Then you go drive to another state and few surprises get thrown at you!
Oh and Stop signs really absolutely terminally mean STOP - that took a little while to get used to. I failed driving test due to this - the seriousness of driving tests, that was yet another "O'RLY, FOR REAL?" moment!
I get it all now after several years, but it was fun living through the cross state road trips.