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Category Archives: Traffic Engineering
Complicated intersections in Rizal – Tikling Junction
There are several major intersections in Rizal Province. Among them are 3 junctions in Cainta, Taytay and Antipolo – Cainta Junction (Ortigas Ave Ext.-Felix Ave), Masinag Junction (Marcos Highway-Sumulong Highway), and Tikling or Kaytikling Junction. The first two are signalized intersections. The last one is supposed to be a roundabout. All three are problematic in various ways and have been associated with congestion along the major roads intersecting at these junctions.
Tikling is quite interesting as traffic seems to have worsened after it was set up as a roundabout. Taytay enforcers have been deployed here but they seem to contribute more to worsening congestion rather than easing it. Motorists familiar with the area will tell you that traffic is better when there are no enforcers. Unfortunately, not all motorists here are from the area or are familiar with the rules for navigating or positioning at a roundabout. And so the intersection is often constricted with vehicles whose drivers and riders don’t practice courtesy.
Perhaps a combination of geometric improvements and more clever enforcement/management can improve intersection performance?
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On roundabouts and how they can improve safety at intersections
Roundabouts are perhaps something that should be considered for Philippine roads. The concern, however, is that Philippine drivers don’t know how to navigate or position themselves in roundabouts. And the results as we have seen in several cases are congested roundabouts or rotundas.
AASHTO (September 26, 2025) “State DOTs Highlight How Roundabouts Improve Safety,” AASHTO Journal, https://aashtojournal.transportation.org/state-dots-highlight-how-roundabouts-improve-safety/%5BLast accessed: 10/19/2025]
To quote from the article:
“To highlight the safety benefits of roundabouts, the Ohio Department of Transportation recently released an analysis of crash data from 76 intersections statewide that had been converted to roundabouts. That analysis indicated single lane roundabouts decreased injury crashes by 69 percent while multi-lane roundabouts resulted in a 25 percent decline.”
And here another quotable from the same article:
“For us, it’s simple. Roundabouts remove cross-traffic turns and eliminate T-bone crashes, while improving traffic flow,” said PennDOT Secretary Mike Carroll …”“Any design that dramatically reduces the most serious crashes we see on the road is worthy of consideration in our projects.”
The article also includes a YouTube video on traffic circles.
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Article share: In Defence of Vision Zero — a Traffic Engineer’s Perspective
On weekends, I try to catch up on reading articles that I have deferred indulging on during busy weekdays. One such article that I have repeatedly put off reading is this one on road safety:
Source: In Defence of Vision Zero — a Traffic Engineer’s Perspective
To quote from the article:
“For years, success in transportation was measured in level of service, vehicle throughput, and reduced delay times. But Vision Zero forced the industry to confront a difficult truth. The more we prioritized speed and volume, the more we endangered the most vulnerable users of the road: pedestrians and cyclists, with particular emphasis on children and older adults. Those who sit in decision-making positions must recognize the realities of physics, namely that the human body is frail and vulnerable to a transportation system that prioritizes throughput over safety.”
The article is a really good read and one that I would recommend for my students in Traffic Engineering to read.
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Traffic congestion along EDSA
I’ve taken some photos of EDSA traffic as well as the EDSA Carousel buses. Here are the more recent EDSA photos I took as I traveled from Makati to Quezon City after serving as a panelist in the Energy Transitions Dialogue last Wednesday.
I took this photo as we passed Guadalupe. I like this in the sense that it shows the clear ROW for the EDSA Carousel buses. One wonders why most of these motorists would prefer to drive their vehicles rather than take the bus or the MRT.
You can see in the photo that EDSA’s northbound side is clogged as far as the eye could see. If you check the image under the MRT bridge, it shows the southbound side was also congested. These photos were taken around 4 PM so this was still an hour before most people would be going home from work.
I mentioned in my comments at the panel that one consequence of giving number coding exemption to electric and hybrid vehicles is that this further diminishes the effectiveness (is it still effective?) of the MMDA’s number coding scheme. I don’t have the stats of how many EV’s and hybrids are registered and running in Metro Manila. Those numbers combined with actual counts will tell us how they are impacting traffic. That would be a nice topic for a paper. 🙂
The photos pretty much describe the transport situation in Metro Manila. Many of our major cities will be heading this way unless they improve their public transportation fast. If they do, then public transport mode share will be sustained if not increased. Metro Manila’s is already being eroded by inefficient public transport, motorcycles (including taxis) and perhaps unintentionally, electric and hybrid vehicles.
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Is it possible to have zero traffic deaths in a year?
Is it possible to have zero traffic deaths in a year? Is it even probable? As it turns out, yes. Here’s an article on what Helsinki did in order to make this a reality:
Andrei, M. (August 1, 2025) “Helsinki went a full year without a traffic death. How did they do it?” ZME Science, https://www.zmescience.com/science/news-science/helsinki-went-a-full-year-without-a-traffic-death-how-did-they-do-it/ [Last accessed: 8/19/2025]
To quote from the article:
“A lot of factors contributed to this, but speed limits are one of the most important,” said Roni Utriainen, a traffic engineer with the city’s Urban Environment Division.
More than half of Helsinki’s streets have a speed limit of 30 km/h (approximately 20 mph). Half a century ago, the city barely had half of its area with a 50 km/h limit (30 mph). They gradually worked to reduce the speed limit, especially around schools and kindergartens.
Smarter street design also played a key role. Pedestrian and cycling infrastructure was prioritized for upgrades in recent years. More and more people started using public transit or bikes, or just walking. Substantial investments also made public transit more efficient and reliable.“Public transport in Helsinki is excellent, which reduces car use, and with it, the number of serious accidents,” Utriainen noted.
Another key component was bringing the police on board. Helsinki introduced automated traffic cameras and enforcement systems, which also helped bring down reckless driving.”
Examples of congestion pricing as applied in major cities
Here is a quick share of an article on cities that have been successful with congestion pricing:
Zukowski, D. (August 8, 2025) “5 cities with congestion pricing,” Smart Cities Dive, https://www.smartcitiesdive.com/news/5-cities-with-congestion-pricing/756987/ [Last accessed: 8/15/2025]
Quoting from the article:
“As cities around the world continue to see increased traffic delays, some have implemented congestion pricing programs to ease gridlock. Congestion pricing acts as a market-based mechanism: increasing the cost to drive in certain areas may encourage drivers to take alternate means of transport or travel at different times. Toll revenues can go to improving roadways and public transit or reducing other vehicle-related taxes.”
Indeed congestion pricing has been around and yet few cities have actually implemented congestion pricing schemes and have had success with it. In the Philippines, the discussions are basically on and off or intermittent. I recall there were already mention of congestion pricing in Metro Manila transport studies back in the 1970s but nothing really came out of those. Fast forward to the present and Baguio City in the northern Philippines implemented their version of number coding, which was supposedly a prelude to some form of congestion pricing but apparently is more of a travel demand management (TDM) scheme along the lines of Metro Manila’s UVVRP. Will we have our own proof of concept sometime soon even for a smaller area or district in any Philippine city? That will also be dependent on whether our so-called leaders can engage their constituents in meaningful discussions on the benefits of congestion pricing.
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Complex intersections in Davao City
My first project upon my return from Japan in 1999 was the Davao City Transportation and Traffic Management Plan Study. We found a few interesting intersections there. These included junctions with more than 4 legs. If all or most movements were allowed at these intersections, they would be most complicated and risky due to the number of conflicts. Of course, not all movements are allowed and many legs are one-way meaning there are fewer conflicts and less risky.
These intersections are large and while there are traffic signals, they were off when I was there.
Surprisingly, there was no congestion or near crashes. Either, traffic was light at the time (before 7AM) or motorists were driving at a level similar to Vietnam (where vehicles were like ants as they moved at intersections).
A bit of trivia here – 1999 to 2002 was the only period in a long time when a Duterte was not mayor of the city. This was the time the former president relinquished the mayoralty in favor of his Vice Mayor and was instead congressman representing the city. He immediately returned after one term rather than serve out 3 terms.
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On the need to rethink traffic metrics
While Level of Service (LOS) criteria is a concept that can be applied to many other transportation facilities and aspects, among the LOS criteria that have been the subject of much criticism (and perhaps rightfully so especially in the context of safety) are the ones used for intersections. These are associated with delay reduction, which always favors vehicular throughput. The latter means basically, high LOS corresponds to prioritizing car (or motor vehicle) movement while not particularly taking into consideration the safety and movement needs of other road users (not using motor vehicles). Here is an interesting article on this matter:
Boenau, A. (July 9, 2025) “The old traffic math that keeps destroying neighborhoods,” Fast Company, https://www.fastcompany.com/91362348/road-design-traffic-math-destroying-neighborhoods-los [Last accessed: 7/15/2025]
Quoting from the article:
Here are three important questions for experts to ponder:
- Is slow-moving car traffic ever safer than fast-moving traffic?
- Do we have any obligation to provide safe and convenient access for people when they aren’t inside cars?
- What are the economic downsides of wider, faster streets in the central business district?
When planners and engineers truly wrestle with those questions, they can choose to remain a conformist who ignores the damage of traffic metrics, or become an outlier in the industry and make a positive impact that might be felt for generations to come. Things can get better in the end.
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Again, I must say that rethinking roads and streets should be context sensitive. Still, safety should be the top concern especially for areas that is predominantly residential and/or school. Safety, after all, comes first in the definitions of transportation and traffic engineering.
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On safe school zones
We’ve been working for safer roads since I started practicing as a transportation engineer/planner. Most recently, we were working on a program supported by UNICEF on Child Road Traffic Injury Prevention (CRTIP). The work towards safer roads especially for those who are most vulnerable is always challenging but it is something that is definitely worthwhile. As we approach May, which is Road Safety Month in the Philippines, I will try to write more about road safety.
Here is an infographic shared by the Road Safety Research Laboratory of the National Center for Transportation Studies of the University of the Philippines:
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On transportation problems being treated like diseases
I am sharing this relatively old article on transportation problems needing treatments as if these were diseases. I say it’s ‘old’ because it’s from last year, and these days when much content is being pushed everywhere including mainstream and social media, things get old, quickly. Rewind to more than a decade ago and Intelligent Transportation Systems (ITS) wasn’t as popularly applied as today and Artificial Intelligence (AI) seems to be everywhere now including in transportation systems.
Menard, T. (September 1, 2024) “Transportation Rx: Treating Traffic Glut Like Doctors Treat Sinus Congestion,” Planetizen, https://www.planetizen.com/features/131478-transportation-rx-treating-traffic-glut-doctors-treat-sinus-congestion [Last accessed: 4/21/2025]
To quote from the article:
“Traffic congestion is not unlike congestion that builds up in the human airways. When we see a doctor, we are prescribed a treatment that clears the backup. Similarly for roads, rather than setting up road signs and cones to redirect traffic, cities can take a more prescribed treatment approach through methods such as congestion pricing and other road pricing strategies, as well as technologies like edge computing, navigation-enabled Mobility-as-a-Service (MaaS) modeling, and transit signal prioritization. “
This is not the first article to allude to medicine when the topic is traffic congestion. There are others that use terminology from the human body’s circulatory system. When an artery gets blocked, a bypass can be a solution. But perhaps we don’t need bypasses and look at other. more effective ways of dealing with transportation problems.
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Caught (up) in traffic 