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Archive for November, 2007

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 28 2007

Traffic Tidbits: 28 November 2007

Published by Bill Ruhsam under tidbits, traffic, signals

New Traffic Forecast Model in the Works: Bristol University is developing a new traffic forecast model. This is something that is decidedly non-trivial and depends upond good data. To quote from the article:

However, if you are using inductance loops that are close enough together, you can identify the driving patterns of individual vehicles and, with such data from the millions of vehicles on the motorway, you can build up really quite detailed models of driver behaviour.

The fundamental problem isn’t the modelling, or even the application of the model, it’s gathering enough real time data and crunching it within a useful amount of time. The first, gathering the data, is expensive and hardware intensive; the second still has some computing issues to overcome. Go Bristol, I say, because if they can make it work, my job becomes easier.

Conventional Traffic Signal Timing is So Last Century: Professor Helbing at ETH Zurich proposes a new type of compensative signal timing. The proposed system could work wonders, but only if government and drivers would buy in.

Don’t Shoot and Drive: Man is caught shooting out video detection cameras.

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Nov 27 2007

Episode 7 - Americans With Disabilities Act

Published by Bill Ruhsam under access, pedestrian, podcast

Topics: Americans with Disabilities Act: Accessible Road Design.

 
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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

Singing Roads

Published by Bill Ruhsam under engineering, fun

I’ve been advocating for years that we cut rumble strips into our roadways that play songs! It would be simple to space out the grooves in order to generate simple melodies.

The Japanese have beat me to it.

I still dream of hearing the Muppet Show Theme as I drive down the interstate. Someday…

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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 15 2007

Test Posting

Published by Bill Ruhsam under blog admin

I’m testing a new blog posting software called BlogDesk. It is intended for people who wish to post to multiple blogs simultaneously.

It seems to be working.

Crossposted to Evil Eyebrow and Talking Traffic

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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 12 2007

Episode 6 - Pedestrian Facilites

Published by Bill Ruhsam under pedestrian, safety, podcast

Topics: Pedestrian Facilities: the give and take between pedestrian and vehicular design.

 
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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