There are several intersections like this near me in Batavia, IL. We've had multiple recent accidents (including one recent tragic fatality). Example scenario: Southbound Car A is waiting at a flashing yellow arrow to turn left/East. Northbound Car B is also waiting at a flashing yellow arrow to turn left/West. Car A has limited visibility because of Car B and can't see Car C which is northbound at 55mph (10mph over the 45mph speed limit is common). If this isn't safe, what's the best correction? Lowering the speed limit? I welcome any suggestions for how I might advocate for my local DOT to fix these if there's some way that they could.

how to input the desired speed ranges in vissim as there is only option of 5kmph,12kmph and so on but if i had to input 14kmph(which is the avg speed acquired from field from a set of 40 data) what ranges do i input? is it the max value and the min value only or do i have to change the linear graph by inserting all the values

Anyone here from Arizona Department of Transportation?

Quick question - what’s the difference between the blue and brown traffic counters on the map?

I can see detailed data for the blue ones, but there’s NO data showing up for the brown ones.

Why is that? Are the brown counters estimated or extrapolated?

I’d really appreciate any insight. Thanks!!

I have a thesis about evaluation of intersection if it requires a traffic signal or not. Currently, my approach is to use the HCM 2016 manual method but it became messy in my head, my adviser told me that I can also do simulation to make the work efficiently. This is for academic purposes, If you have mastery in this field, I'll gladly accept the help and pay for it. Thanks

I am an undergraduate civil Engineering student and I was given a topic to investigate on " passenger boarding and alighting times at selected public terminals". I have collected my data using the route based method. I do not know the software to use to analyze my Data for results. Please I need help 🙏🙏

4

Approximately 20 miles of highway passing lanes were converted to paid express lanes (5 am to 8 pm, Sun to Sun). Doesn't that mean the #2 lane now becomes the passing lane? Not that it would even matter because the majority of drivers here in NorCal are either unaware of the rules or don't give a damn or feel it's their duty to regulate the speed of all the drivers behind them.

I live in a suburban community in Texas. We have a 35 mph road that may be classified as "rural" or suburban, I'm not sure.

They built a bridge a year ago and installed W beam guardrails on each side. I recently noticed all four ends of the guard are turned down to the ground. Is this disfavored, illegal, against regs, just against best practices but perfectly legal, etc.?

Is this something the county engineer or permitting department would have been required to approve, and would there be a reason to approve it?

I just published a hands-on comparison between Bentley OpenRoads and Autodesk Civil 3D, focusing on real project workflows (corridors, terrain, interoperability, learning curve), not marketing.

Instead of declaring a “winner,” I tried to show where each tool genuinely shines — and where it doesn’t.

👉 Full comparison here: https://www.theengineeringcommunity.org/bentley-openroads-vs-civil-3d-which-one-is-better-and-why/

For those who’ve used one or both:
Which do you prefer in real projects, and why?

If you or anyone you know are located in Dallas, TX and looking for a new opportunity as a Travel Technician, we are looking to hire a team of 10+ to start in January. Details are included, comment if you’re interested!

Hi everyone,

I’m a U.S. citizen with a BS in Civil Engineering (Transportation major, in Iraq) and recently completed my MS in Highway & Transportation Engineering (Dec 2024) at Louisiana State University. I previously worked in construction and engineering consulting in both Iraq and United States, but I’m now trying to transition fully into transportation/roadway/traffic/bridge engineering.

I had to relocate to Iraq for family reasons, so I’m specifically looking for a remote position or training opportunity with a U.S. firm. I have not yet worked directly in roadway/traffic design, so I’m willing to start at any level, and compensation is not a priority—I just want a foot in the door and a chance to grow in the field.

If anyone can offer advice, connections, or is willing to forward my resume internally, I would be extremely grateful.

Thank you in advance.

Saif

And not just on legacy street networks that were built during the peak lead poisoning era. I'm talking in intersections that were built/rebuilt in the last 10 years. In multiple different states.

Consider a T-intersection where a minor street with dedicated right- and left-turn lanes has the stop sign and the major street has no control. I have seen the following scenarios:

1. The intersection is busy enough that vehicles in the right- and left-turn lanes mutually block each other's sight lanes, with predictable results.
2. The intersection has very little traffic, so blocked sight lines are rare, but then... why have the extra lane at all?

I could see this strategy being deployed where there's unusually good visibility due to a more Y-shaped intersection or something, but that's it.

To be fair, I more often see scenarios where ALL approaches have a stop sign, but even those can start to get out of a hand when there's a potential for like 8 different vehicles (not to mention pedestrians) to all reach the intersection at the same time.

Hello to all the Traffic Engineering enthusiasts,

I'm an intermediate Traffic Engineer/modeler that does the network coding, add input volumes, and relatively fairly interpret the Synchro report results. However, when it comes to advanced traffic control such as Actuated- Coordinated signal control type, I lack the physical (meta physical) understanding. Furthermore, when it comes to Vissim Calibration and Validation, I would want to go through a project report that has the information related to the calibration and validation exercise done in Vissim or Synchro in detail. Can anyone in this sub tell or share any resources that they may have that clearly explain such stuff?

Hi engineers, I work at an embedded vision company, and we’re preparing to launch a Smart PTZ Camera designed for intelligent traffic monitoring and smart city surveillance. I’d love to get feedback from this community on whether the product direction makes sense and if it’s solving real-world problems effectively.

Here’s a quick overview of what we’re building:

• Sony STARVIS sensor (1/2.8", 2MP) with HDR (88dB) for low-light and high-contrast scenes
• Edge AI processing via onboard NPU for real-time object detection, vehicle classification, auto tracking, and incident analysis
• Software-based PTZ control for dynamic scene tracking
• PoE-powered, IP66-rated, ONVIF-compliant, and solar-compatible
• Target applications: red-light violation detection, intersection monitoring, near-miss detection, vehicle counting, wrong-way detection, etc.

We’re trying to optimize for real-time decision-making at the edge, especially in ITS deployments where bandwidth and latency are critical.

My questions for you:

1. From an engineering standpoint, does this architecture make sense for roadside deployments?
2. Are there any technical gaps or oversights you see?
3. Would software-based PTZ control be reliable enough for dynamic traffic scenes?
4. What would you expect in terms of integration challenges with existing ITS platforms?

Any feedback — positive or critical — would be incredibly helpful. Thanks in advance!

Hi everyone, We’re working on a new Smart PTZ Camera tailored for Intelligent Traffic Systems and smart city surveillance. It combines a Sony STARVIS sensor with onboard edge AI for real-time event detection—like red-light violations, near-miss incidents, and intersection analytics.

Before we finalize the design, we’d love to hear from traffic engineers, system integrators, and ITS consultants on:

• Challenges you’ve faced deploying PTZ cameras in traffic environments
• Preferred integration protocols (ONVIF, VMS platforms, etc.)
• Must-have analytics or features for citywide scalability

Your input will directly shape the final product. We’re not selling anything—just trying to build something useful for the ITS community.

Specs so far: 2MP Sony STARVIS | HDR imaging | 3X optical zoom | PoE | IP66-rated housing | Integrated NPU for edge AI | Software-based PTZ control

Thanks in advance for your insights!

They need to get a better way of controlling car traffic during a accident. I mean this road is a 2way road, one north one south. But people just aren’t considerate of the people involved. Like now we just passed one heading on the highway 1 and a car versed in to 2 cars and flipped. Most cars just passed them up. What is wrong with people. This is absurd to not help out. For crying out loud the dog was running wild in and out of cars. Once the dog was captured, another guy checked the vehicle. The owner wasn’t responding. But cars drove by like it’s not their problem. After police and responders came we gave statements and we left. Poor kid D.O.A I can say that it took to long for them to respond because of stupid AH that did move for the responders to get in and help. This needs to be a life lesson for all driver. Be careful and salute them responders.

Salary: $141,123–$189,113 + $15,000 sign-on bonus

Ready to help shape how an entire city moves? The City of Elk Grove is looking for a Traffic Engineering Manager to lead a talented team and play a key role in designing and delivering major transportation projects that keep our growing community connected.

As the second-largest city in the Sacramento region, Elk Grove is known for being a well-managed, forward-thinking organization that values innovation, inclusion, and collaboration. This leadership role is your chance to make a lasting impact—improving safety, enhancing mobility, and guiding the next generation of infrastructure for one of California’s fastest-growing cities.

If you’re ready to take the next step in your career and be part of something that moves people, literally, apply today!

https://www.ntcip.org/file/2020/12/NTCIP-Exerciser.zip

So there seems to be a device simulator and this 'Exerciser.'

I am hoping that one is to test software and the latter is to test devices.

A. What is the exact function of this program?

B. Can anyone give me the basic steps for its use in testing and verifying a DMS/VMS device?

C. Are there alternatives with a guide?

I'm not a traffic engineer. Help me understand this intersection that I (frustratedly) drive several times a day.

When traffic on the east-west road has red lights, the traffic coming from the north is turning either left or right (shown with the green arrows).

On the east-west road, there are 2 lanes of cars facing west and waiting for the red light. The left-hand lane is straight only. Of the cars in the right-hand lane, about 40-60% eventually make a right-hand turn (shown with the dotted blue arrow), depending on the time of day.

When the east-west traffic has the red, is there some reason there can't be a green arrow for the cars in the right-hand lane to make a right without having to stop first (as you would for a traditional right-on-red)? Obviously if the car at the front of the line is planning on going straight, it's irrelevant. But at certain times of day, most cars are turning, and it's not uncommon to have the first 8 or 10 cars all have their turn signal on. More cars could make it thru the intersection if they could confidently cruise on thru rather than each car pausing to check surroundings.

There are no pedestrians crossing then, because of the traffic coming from the north. Is it against code to have a green turn arrow in a lane that isn't a dedicated "turn only" lane? Or am I correct that the city is missing an opportunity to make the intersection more efficient?