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Archive for the 'news' Category

Jun 18 2008

Ramp Meters

Published by Bill Ruhsam under ramp meter, news

Traffic Congestion:  Image by Mark Woodbury.  http://www.flickr.com/photos/markwoodbury/

Alluding to yesterday’s post concerning the inaccuracies in an Atlanta Journal Constitution article about Ramp Meters, I have an anecdote:

My wife and I go to plays at Oglethorpe University in Atlanta every few months. In order to get there from our house (during rush hour), we avoid the interstates and use surface streets (Johnson Ferry Road, for those of you in the area). We’ve made this trip often enough at the same approximate time that we know what the traffic is like and yesterday we encountered an unusual hang-up as we approached Interstate 285.

The traffic engineer in my cannot let things like traffic backups slide. I began speculating out loud as to the cause of the congestion: wrecks, congestion on the interstate, signal being out, whatever. After 10 minutes or so, we arrive at the interchange and I see it: The Ramp Meters are On!

I laughed. This was the first day that this particular ramp meters was activated and I had totally forgotten.

I predict that there will be a lot of complaints forwarded to the DOT concerning the congestion (on the approach streets) caused by the meters. This sort of project always needs tweaking when it’s first implemented. I opine that the observed congestion (by yours truly) was a bit excessive, but it was only day one. We’ll see how it all falls out. Hopefully, the AJC won’t run with the complaints and publish anything scathing. Give the DOT a chance to get the kinks worked out. This will improve traffic flow in the area.

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Jun 16 2008

Why Talking Traffic?

Published by Bill Ruhsam under ramp meter, news

Why do I do this Talking Traffic website, with its podcast and tidbits?

Because of this:

From the Atlanta Journal Constitution:

Ramp meters are traffic lights that are intended to control the number of vehicles entering and exiting the highway. They are to reduce traffic congestion on the ramps. [emphasis mine]

Argh! This is one hundred percent wrong! Ramp meters in no way are designed to reduce congestion on the ramps, they’re designed to reduce congestion on the highway by “metering” the input of vehicles from the ramps. Instead of a flood of vehicles entering the highway all at once, a steady one…two…three…four addition of vehicles allows the highway to avoid congestive backups. Unfortunately, this causes delays on the ramps and possibly the roadways leading to the ramps.

While your wait to get on the highway will lengthen, the time you spend on the highway itself will decrease. That is why Ramp Meters are being installed in multiple locations throughout the country.

Sounds like a podcast topic to me.

One response so far

May 05 2008

Traffic Tidbits: 5 May 2008

Published by Bill Ruhsam under news, tidbits, government

Housing & Transportation Costs in your Neighborhood: If you live in a metropolitan area, it’s possible that your town is on this survey of transportation & housing costs by median income. Check it out.

A Blow for Gender Equality: Sweden introduces a new walking-woman symbol to optionally replace the walking-man at pedestrian signals.

UK Stepping on Lollipop Violators: I’d never heard the term ‘lollipop’ as it’s applied in this article about Lollipop Road Rage.

“STOP! In the name of Love”: Stop sign accoutrements to increase awareness. FHWA says, “Nuh uh.”

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Jan 22 2008

Traffic Tidbits: 22 January 2008

Published by Bill Ruhsam under rail, transit, news, politics, tidbits

Rail Riders in Connecticut: A blog posting concerining the recent release of a commuter rail evaluation in CT. It discusses what is going well, and what can be improved on.

“US Transportation in 2015″: A gaze into the crystal ball of transportation development in the United States.

The National Surface Transportation Policy and Revenue Study Commission: SAFETEA-LU, (a lovely acronym standing for Safe, Accountable, Flexible, Efficient Transportation Equity Act: a Legacy for Users, othewise known as the transportation funding act passed in 2005) required the implementation of The National Surface Transportation Policy and Reveune Study Commission. They have released their report. The administration has declined to endorse it. Multiple people are evaluating its recommendations and the administration’s response. Apparently there were also some sections regarding Transit that were excised.

The highlights of the report: Transportation is underfunded by 60%. Raise federal gas taxes by $0.40 over five years. Personally, I think the administration is on the right track here. Continued dependence on fuel taxes is a no-win scenario because we want to reduce the amount of fuel (whatever it is) that is needed to get from A to B. This leaves transportation funding high and dry. Usage fees such as tolling, managed lanes, and pay-per-mile are the wave of the future. Correctly, I think.

One response so far

Jan 04 2008

Traffic Tidbits: 4 January 2008

Presidential Candidates and Transit: How do the Democratic and Republican candidates stack up on the Transportation issue? Live from the Third Rail has the lowdown.

New Rules for Lithium Batteries on Airplanes: Passengers beware. There are now restrictions on lithium-ion batteries in your check luggage. Essentially, you may only place them in checked luggage if they are inside the device they are intended to power.

Cell Talkers Drive Slowly: A study out of the University of Utah finds that people talking on cell phones, even with hands-free devices, drive more slowly and make fewer lane changes. The study indicates the implication that this may cause increased traffic congestion. The Media has locked on to this saying that CELL PHONES CAUSE TRAFFIC JAMS which is not a legitimate conclusion from the study. I do not deny that this is probable, but the conclusion reached by media outlets is overstretching the data.

Maintenance is Key: A pothole (called a crater here) has caused months of congestion in Kolkata, India. Maintenance of existing infrastructure is important. Inter-agency agreements are even more important.

Mathematical Modeling of Traffic Jams: Backward-moving waves of traffic jam congestion have been a topic of study for some time. A team of mathematicians at the Univerity of Exeter have produced a model that accurately reproduces congestion. I’d like to say this was a break-through, as the article implies, but it’s not. These sorts of events have been studied for a long time.

Public Transportation for Dummies1: A brief primer for beginners who are not used to the public transportation system.

1If I were trying to be a gamer-geek, I would have said, Public Transportation for n00bs, but that would be posing

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Nov 30 2007

Navigation without GPS

Published by Bill Ruhsam under gps, navigation, news

In the age old days of yore, when there were no satellites floating through space in earth orbit, people were forced to navigate using “maps”. Now that GPS receivers and onboard navigational computers have been linked, companies like Garmin guarantee that you’ll never get lost on your way to a relative’s house again. However, you’re still dependent on those satellites in orbit. If you’ve got crappy sky views, or are driving through a canyon, you’re stuck.

Now Google has launched an application for their mobile maps product that relies on triangulation between cell phone towers to do exactly the same thing. Using signal time of arrival, the mobile device can pinpoint your location to within the bounds of accuracy needed for automobile navigation. I wouldn’t use this software for trying to find one particular spot (i.e., no geocaching) but for following a road map, pretty nice. This application will suffer from some of the same drawbacks as GPS, especially the low-coverage problem (not a lot of cell towers in the deep dark reaches of rural roadways), but it offers a second solution to the navigation problem.

This is not a new idea, but Google is, as usual, one of the first organizations to push it out into common use. There have been proposals to use cell tower triangulation for 911 geolocation, but I don’t know if there has been any progress on that front.

2 responses so far

Nov 15 2007

Traffic Tidbits: 15 November 2007

Navigation Devices causing Havoc: An English village is complaining that since satellite navigation devices have started identifying their main street as the “quickest route”, the traffic has been a nightmare. It’s time to do some strategic networking with the various navigation companies.

Welsch Speed Bumps: I won’t even attempt to pronouce this word. Twmpath (/tʊmpaθ/).

Why is Israeli Traffic Different? Tali Aben answers that question on her blog.

Bicyles as Second Class Citizens: Bill Bean of Take the Lane points me to the website of Bob Shanteau, who is asking why there is such an engineering bias against bicycles in this country. He rightly complains that there is little data, and less reliable research that treats on how to effectively manage a bicycle/vehicle roadway project. I talked about the historically anti-pedestrian bias in road design in my last podcast, but I think we need to talk about bicycles soon.

2 responses so far

Nov 15 2007

Rising Metal Theft

Published by Bill Ruhsam under news, signals

There was a news article yesterday about wire theft causing a signal outage in Washington state.

This comes on top of continuing news that copper piping is being stolen from construction sites (both before and after installation).

Like petty theft, muggings, and liquor store robberies, I wonder if the benefit-cost ratio of these activities is greater than 1.0 (for the thieves)?

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Nov 12 2007

Congestion vs. Law Enforcement II

Published by Bill Ruhsam under news

Last week I posted about a 2 hour shut down of I-75 to try and apprehend a bank robber.

There is an update in the case. The guy turned himself in.

The only given reason why the I-75 roadblock might have failed was a mention of the GPS device. “”He either defeated it, or it failed,” said the Cobb County police spokesperson.

2 responses so far

Nov 09 2007

Congestion vs. Law Enforcement

Published by Bill Ruhsam under news, safety, government, traffic

Yesterday in Atlanta, GA, my wife was significantly delayed on her commute home due to a traffic jam on northbound I-75. After she called me, I, being a dutiful husband, checked the traffic conditions on Georgia Navigator. I reported to her that there was an “All-Lanes-Closed-Incident” on southbound I-75 and that she would get past it in a few minutes. Given that she was in the northbound lanes, this was something of note, but not of real concern; it happens fairly frequently around Atlanta that one interstate or another is closed due to a wreck.

Later, Jenn called me to report that the southbound lanes hadn’t been closed due to a collision, but instead because the Cobb County Police department had set up a road block to search for a bank robber. This incident, unsurprisingly, made the news this morning in the Atlanta metro area paper. According to the news report, the Cobb County police had specific information from a GPS tracker in the stolen money that the perpetrator was on I-75 south, which led to the closure and subsequent search of rush hour traffic (the robber was not located).

My first gut reaction to this was, “Is it worth it to cause that much headache and congestion for a non-violent bank robbery?” Just as a guesstimate, with data from GDOT saying that the daily traffic past this point is about 207,000 vehicles, I would say that about 30,000 vehicles experienced at least an additional 20 minutes worth of delay. Do the math and that is 10,000 vehicle-hours of delay due to the stoppage. Throw in a reasonable rate of $15 per hour per vehicle, discounting the huge air-quality impact that this had, and we come up with a figure of $150,000 (assuming only one person per vehicle). Did the robber make off with more than that? If not, than this was not a very good economic call on the part of the Cobb County Police Department.

Of course, not everything boils down to economics, and I certainly don’t want to live in a world that looks like THX-1138, where all decisions are based on budgetary concerns. I applaud the Police for their efforts and the bank for slipping the perpetrator a tracking device. I’m disappointed that he wasn’t caught.

This is a tough question. When is it appropriate to shut down a major artery, be it transportation, water, electric, whatever? Several years ago, we had a rash of suicidal people who would perch on overpasses and threaten to jump. The police and emergency responders had no choice but to shut down the highways below, causing huge disruptions which could be measured in the millions of dollars. The scuttlebutt around town was, “let ‘em jump!” or “shoot ‘em!”, which should tell you the toleration Atlantanites have for people causing congestion (my personal idea was to drive up the interstate with a fire truck and blast the jumper back onto the bridge with a hose, then jump on them).

How do we address the question of public safety vs. public mobility? Should we interrupt the afternoon commute of a major metropolitan area because of a bank robber? Is the life of one person worth two hours of time of 40,000 people? Can we even measure the worth of an incident based upon the perceived economic impact of delay on local commuters? Didn’t everyone who moved to a major metropolitan area consciously sign up for these sorts of delays? Who decides? I hesitate to call this a federal issue because I don’t want to pass any more authority back to Washington, but I also hate to call this a state’s issue because these problems don’t end at state lines, and states often have a raucous history of negotiations.

The one thing that can be stated with certainty in transportation issues is that there is nothing that can be stated with certainty.

3 responses so far