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Tag Archives: traffic engineering
On the coordination of traffic signals
I took a couple of photos while we were traveling along Espana Boulevard. I wanted new photos of the traffic signals along Espana to use as visuals for my examples whenever I discuss traffic signals and their coordination or synchronization in my lectures.
Green signal for traffic. If the traveler is able to travel at the optimum speed, one will be able to catch the green light at so many intersections along Espana. The road is the major thoroughfare in the area and traffic along it is prioritized over those from the side roads to maximize the throughput along Espana.
If one catches a red light at one intersection, it is possible that the traveler will catch a red light in the next intersection(s).
On phasing out cars in cities
I’m sharing another article on reducing car dependence. The article was referred to by the previous series that I shared recently.
Nicholas, K. (April 14, 2022) “12 best ways to get cars out of cities – ranked by new research,” The Conversation, https://theconversation.com/12-best-ways-to-get-cars-out-of-cities-ranked-by-new-research-180642 [Last accessed: 5/20/2022]
Here are a few excerpts from the article:
“Question: what do the following statistics have in common?
The second-largest (and growing) source of climate pollution in Europe.
The leading killer of children in both the US and Europe.
A principal cause of stress-inducing noise pollution and life-shortening air pollution in European cities.
A leading driver of the widening gap between rich and poor urban residents.
Answer: the vehicles on our streets, primarily the not-so-humble passenger car.”
“The research is clear: to improve health outcomes, meet climate targets and create more liveable cities, reducing car use should be an urgent priority.”
“To meet the planet’s health and climate goals, city governments need to make the necessary transitions for sustainable mobility by, first, avoiding the need for mobility (see Paris’s 15-minute city); second, shifting remaining mobility needs from cars to active and public transport wherever possible; and finally, improving the cars that remain to be zero-emission.”
You can also listen instead of reading it as it is a narrated article.
Articles on examining the role of the planning profession in both perpetuating and solving traffic congestion
Planetizen recently published a three-part series of articles examining the role of the planning profession in both perpetuating and solving traffic congestion:
Part 1: Brasuell, J. (April 13, 2022) “Planning and the Complicated Causes and Effects of Congestion,” Planetizen, https://www.planetizen.com/features/116834-planning-and-complicated-causes-and-effects-congestion [Last accessed: 5/17/2022]
Part 2: Brasuell, J. (April 20, 2022) “How Planning Fails to Solve Congestion,” Planetizen, https://www.planetizen.com/features/116914-how-planning-fails-solve-congestion%5BLast accessed: 5/17/2022]
Part 3: Brasuell, J. (May 12, 2022) “Planning for Congestion Relief,” Planetizen, https://www.planetizen.com/features/117153-planning-congestion-relief?utm_source=newswire&utm_medium=email&utm_campaign=news-05162022&mc_cid=34b0612d40&mc_eid=9ccfe464b1 [Last accessed: 5/17/2022]
I think these articles are a must read especially for students (and not just practitioners or professionals) and is sort of a crash course on transportation engineering and planning. It covers many concepts and learnings from so many decades and touches on certain programs that are most effective in reducing car trips. To quote from the article, the top 12 programs based on case studies in Europe are:
- Congestion Pricing (12-33% reduction in city-center cars)
- Parking and Traffic Controls (11-19% reduction in city-center cars)
- Limited Traffic Zones (10-20% reduction in city-center cars)
- Workplace Mobility Services (37% drop in car commuters)
- Workplace Parking Charges (8-25% reduction in car commuters)
- Workplace Travel Planning (3-18% drop in car use by commuters)
- University Travel Planning (7-27% reduction in car use by university commuters)
- University Mobility Services (24% drop in students commuting by car)
- Car Sharing (12-15 private cars replaced by each shared car)
- School Travel Planning (5-11% reduction in car use for school trips)
- Personalized Travel Planning (6-12% drop in car use share among residents)
- App-Based Incentives (73% – proportion of app users declaring reduced car use)
Are we ready to confront congestion and at the least start discussing these car trip reduction programs? Or are we content with the current discourse, which remains car-centric?
History: article on how jaywalking came to be
I am sharing this article on the invention of jaywalking. It is a very informative articles and gives context to the current situation where cars dominate streets and car-centric policies and infrastructure diminish pedestrians and walking. I’ve always said that history should enlighten us about how it was, how it came to be and what we need to change now if we are to attain a more sustainable transport system that will contribute to improving safety and ultimately, quality of life.
Thompson, C. (March 29, 2022) “The invention of ‘Jaywalking’,” Marker, https://marker.medium.com/the-invention-of-jaywalking-afd48f994c05 [Last accessed: 4/2/2022]
To quote from the article:
“It’s not totally clear who invented the phrase, but it was a fiendishly clever portmanteau. In the early 20th century, the word “jay” mean an uncultured rube from the countryside. To be a “jaywalker” thus was to be a country bumpkin who blundered around urban streets — guileless of the sophisticated ways of the city…
Ever after, “the street would be monopolized by motor vehicles,” Norton tells me. “Most of the children would be gone; those who were still there would be on the sidewalks.” By the 1960s, cars had become so dominant that when civil engineers made the first computer models to study how traffic flowed, they didn’t even bother to include pedestrians.”
The article showed photos of pre-automobile times in the US. Here’s a photo of pre-automobile Manila for context:
And here’s Manila during the American period but with most people walking or taking public transport in the form of the tranvias:
Chaotic as the scenes appear to be, these streets were definitely safer and perhaps saner than what he have now. The challenge is how to re-orient our streets and reclaim it to favor people instead of cars.
Transportation topics at the College of Engineering’s Professorial Chair Colloquiums
The College of Engineering of the University of the Philippines Diliman started holding its annual colloquiums (plural because each Institute and Department under the College are holding their colloquium mostly during this last quarter of the year).
The Department of Mechanical Engineering already held theirs last September. There were four topics on transportation: 1) Dr. Gerald Ko C. Denoga (Fernando N. Serina Mechanical Engineering Professorial Chair) presented on “Reduction of Light Rail Transport Energy Demand via Powertrain Modeling and Optimization of Operating Parameters”; 2) Dr. Juvy A. Balbarona (Renato M. Tanseco Professorial Chair) presented on “Timetable Optimization for Light Rail Transit (LRT 1)”; 3) Asst. Prof. Roderaid T. Ibanez (Team Energy Professorial Chair) presented on “Energy Demand Quantification and Conservation Strategies of Bus Transport Terminal Facilities along EDSA”; and 4) Dr. Edwin N. Quiros (Federico E. Puno Professorial Chair) presented on “Fuel Economy Results from Diesel engine Tuning for Steady Speed and Drive Cycle Operation”.
There is one transport related topic in the Department of Computer Science colloquium. On October 25, Dr. John Justine S. Villar (Dean Reynaldo Vea Professorial Chair) will be presenting on the “Efficiency Measurement of Domestic Ports in the Philippines Using Data Envelopment Analysis.”
The Institute of Civil Engineering will be holding its colloquium on October 28 – 29, 2021 with the following transport-related topics: 1) Asst. Prof. Rosabelle Louise A. Caram (DCCD Engineering Corporation Professorial Chair), “Utilization of Plastic Laminates in Asphalt Cement Mastic”; 2) Dr. Hilario Sean O. Palmiano (David M. Consunji Professorial Chair in Engineering), “Validation of a Customized Local Traffic Simulator (LocalSim)”; 3) Dr. Jose Regin F. Regidor (Ambrosio Magsaysay Professorial Chair in Engineering), “Pedestrian Safety Assessment Within Public Elementary School Zones in Quezon City using Star Rating for Schools”; 4) Dr. Ricardo DG. Sigua (Dr. Olegario G. Villoria, Jr. Professorial Chair in Transportation/Logistics), “Study of Motorcycle Rider Casualties at Signalized and Unsignalized Intersections”; 5) Dr. Karl B.N. Vergel (Quintin and Norma Calderon Professorial Chair), “Estimation of Transportation Energy Demand of the Philippines”.
Other departments have not posted yet about their schedules or topics yet. The Electrical and Electronics Engineering Institute (EEEI), for example, will have their colloquium this coming October 25 but have not posted a detailed schedule yet. They usually have several transport-related topics including those on traffic signals, vehicle detection, and bike share innovations.
More details and updates including registration to these colloquia may be found at the UP College of Engineering Facebook page: https://www.facebook.com/updengg
Revising the DPWH Design Manuals
A friend posted about the current initiatives in the US as they embark on revising their Manual on Uniform Traffic Control Devices (MUTCD). This manual along with AASHTO’s Geometric Design of Highways and Streets and their Highway Capacity Manual are something like the holy trinity for Highway and Traffic Engineers. These are also the main references for our DPWH for the manuals and guidelines we use in traffic and highways.
Here are a couple of articles calling for the revisions to reflect recent designs mainly from NACTO, which itself publishes guidelines for roads to be more inclusive rather than car-centric:
NACTO (May 2021) Modernizing Federal Standards: Making the MUTCD Work for Cities, https://nacto.org/program/modernizing-federal-standards/
NACTO (May 11, 2021) A Blueprint to Update America’s Street Manual, https://nacto.org/2021/05/11/a-blueprint-to-update-americas-street-manual/
We don’t have to pattern revisions after the MUTCD but then that requires that the DPWH through its Bureau of Research and Standards (DPWH-BRS) do its part in compiling, reviewing, studying and adopting materials from various countries, and developing suitable standards and guidelines for roads in the Philippines. Do they have to reinvent the wheel? Not so and they can still refer to the US manuals as long as again these are localised for our conditions and situations.
Vienna Conventions on Traffic and Road Signs
There are two important international conventions or agreements that the Philippines is a signatory to. These are the
Vienna Convention on Road Traffic (November 8, 1968):
and the Vienna Convention on Road Signs and Signals (November 8, 1968):
These are important as signatories are bound but the agreements on road traffic rules and regulations and standard signs and signal. I included the links to each agreement as they also include the exceptions taken by different countries such as Thailand and Vietnam declaring they will not be bound by Article 44, choosing to classify mopeds as motorcycles. Apparently, the Philippines did not declare exceptions or objections to any of the articles.
Are the traffic signs in the Philippines the same as those in the US?
This seems to be a simple question with a simple answer. And the answer is no. While the Philippines is signatory and has ratified the Vienna Convention on Road Traffic and the Vienna Convention on Road Signs, the United States hasn’t. The US also depends on their Manual of Unified Traffic Control Devices (MUTCD) that is by their Federal Highway Administration (FHWA).
Here is a nice article on Wikipedia for a comparison of signs in different countries:
I recall an interesting project I was involved in where we audited signs along what was a new Subic Clark Tarlac Expressway (SCTEX). The signs from Clark to Subic followed international convention while the ones from Clark to Tarlac followed the MUTCD. We recommended that the latter signs be changed to international convention. I am not sure if the tollway operator changed the signs as I recall there were still US standard signs there particularly for speed limits.
The term ‘sharrow’ basically short for shared right-of-way and refers to lanes or roads that are ‘designated’ for all modes of transport including and especially non-motorized ones such as bicycles. It also refers to the lane markings. There have been some mixed experiences and opinions about sharrows; particularly referring to whether they are effective. Here’s an article from the director of technology of Smart Design, which is a strategic design and innovation consulting firm in the US that gives another opinion (an evidence-based one) about sharrows:
Anderson, J. (September 30, 2020) “Safer with sharrows?”, World Highways, https://www.worldhighways.com/wh12/feature/safer-sharrows
I guess the experiences in different countries vary according to several factors. Perhaps these include cultural factors that also relate to human perceptions and behavior? Education is also definitely a factor here aside from awareness. And we have to work harder on these and together, rather than play the blame game on this matter that relates to safety. How many times has the observation that Filipinos tend to regard road signs and markings as merely suggestions rather than guides and regulations?
On the efficiency of transportation – a crash course on transportation engineering concepts
There is an excellent article on the efficiency of transportation systems:
Gleave, J. (2019) Space/Time and Transport Planning, Transport Futures, https://transportfutures.co/space-time-and-transport-planning-1aae891194e5 [Last accessed: February 25, 2019].
It is highly recommended not just for academics (including students) but also for anyone interested in transportation and traffic. It’s like a crash course in transportation engineering with a lot of basic concepts in traffic engineering and traffic flow theory being presented for easy understanding by anyone. Enjoy!