Circles create confusion as to who has the right of way.
This may be true of "circles" but it's not true of European-style roundabouts as we have on Richland Avenue. If you know the rules, which are very simple, they are a breeze to navigate. You simple "give left" to anyone currently on the roundabout, and then once you are on the roundabout you have the right-of-way over anyone trying to get on it. You simply go around until you get to your exit and go on that road. If you miss it, you can simply circle around a second time, without missing a beat. My first exposure to roundabouts was in England in the previous decade where you had to "give right" because those Limeys drive on the wrong side of the road. But even there, after a lot of initial confusion, I got the hang of it. The only people now that I see having trouble with the Richland roundabout are people from out-of-town (like on Parents Weekend) who haven't had much experience with them. For the record, I was initially very skeptical about the Richland roundabout and thought the locals would never get the hang of it. I was wrong.
They are inefficient compared to a signalized intersection.
Completely untrue. The Richland roundabout shows this in spades. Traffic flow is 100 percent more efficient now than when it was signalized, even in peak flow periods.
They are also brutal on pedestrians, since most don't have the underground passage like Richland Avenue.
I would concur on this point. All roundabouts where there is also sufficient pedestrian traffic should have tunnels or bridges for pedestrians.
Then again, that underground passage increases noticeably the time you need to cross the circle.
Tough cookies. Most Americans need the exercise. ;-)
Where to begin ?
1.As far as the European model,its 100% anecdotal, but I recall a number of films that make use of the confusing nature of European roundaboouts.
2.If you know and follow the "rules of the road",have relatively low traffic volumes and are familiar with a particular roundabout it might work.
But without all of those things,a roundabout, especially in high traffic areas,like New Jersey,don't work well and cause more accidents then signalized intersections especially during rush hour.
3.Sorry but I have to disagree on capacity.Every traffic study I've seen, as well as actual traffic counts, show that a properly signalized intersection not only has greater capacity,but also has a better "level of service" which takes into account a number of factors.
4.I agree 100% about exercise.
Then again,running across traffic lanes to avoid being hit is great exercise.
As to Allen's comment.
If that was happening,the signals weren't properly timed/phased.
That can also been an issue,depending on how the pedestrian button "over rides"
work.
Hmmm I'm going to have to step in and counter your Engineer opinion with my Urban Planner opinion. Roundabouts are so much safer than signalized intersections and that's why they are superior. They remove the deadliest points of conflict, which are left turns. Just using the Athens one as an example, that intersection used to be one of the most dangerous in the state and now it is very safe. What you have in NJ are not roundabouts, by the way. New Jersey traffic circles are a completely different animal, and I agree they are confusing and need to go.
Also, to your point about parking in downtowns. How did you come to the conclusion that one-way streets are best or that removing on-street parking is a good idea? One way streets encourage speeding and are a huge hazard to pedestrians as a result. More recently, their ability to move traffic faster (the only reason they are ever cited as good) has even been questioned. Likewise, parallel parking provides a buffer between traffic and the sidewalk creating a safer pedestrian environment. Academic research has shown positive correlations between parallel parking and economic vitality of a commercial area. I should also note that surface parking has the opposite effect, gobbling up land that could be used for a better use while also increasing distances between destinations (which kills pedestrian life and hurts businesses).
It seems from your comments that your only concern is moving traffic through an area as quickly as possible--which is a very old school way of thinking. We now realize that a little bit of congestion is okay, because congestion means that people want to be in your downtown (i.e. Manhattan is much more congested than downtown Detroit).
http://www.wsdot.wa.gov/Safety/roundabouts/benefits.htm http://www.citylab.com/commute/2013/01/case-against-one-w... /
https://www.washingtonpost.com/news/wonk/wp/2015/04/17/wh... /
http://articles.philly.com/2012-05-19/news/31766282_1_lim...First off,in addition to an engineer,I'm also licensed as a professional planner in N.J.
What I've seen in the Downtown Revitalization Projects I've worked on is that "convenience" seems to be a primary factor in people using a Downtown Business District (DBD) ,as opposed to malls.
I work primarily in Bergen County,the shopping center capital of the world it seems.
Malls killed the DBD's in most Towns around here and they've been trying to reverse the trend since the early 1970's.
Most of our DBD's have 2 lane roads through them.
With two way traffic, anyone pulling into,out of, or waiting for an on street parallel parking space stops traffic in that direction until the parking maneuver is completed.Thats not congestion,that's grid lock.
With a one way street there is the ability for some traffic flow to be maintained with on street parallel parking.
Obviously this only works if you have 2 parallel streets to handle traffic each way.
The situation is further improved by the use of "tandem" parallel spaces.
By the way,as far I know,most of midtown Manhattan is one way.
As far as speeding,most of the DBD's have traffic lights every couple of blocks.
Combine that with "Traffic Calming" and the sheer number of vehicles in this area and speeding hasn't been an issue.
We also found that promoting multi-use buildings with residential,retail and office in the same building or complex combined with convenient off street parking helps a lot.
There are a number of options for Downtown Redevelopment.
Some of my approaches may be "old school",but I've seen and continue to see them be successful.