Questions tagged [traffic-intersections]

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Need help identifying this three-layer diverging diamond-style interchange

I'm an avid fan of Cities: Skylines, and it has occurred to me that one of the types of interchanges that seems to fare very well with the simulated traffic is this three-layer diverging diamond (...
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3answers
113 views

What kind of splines should be used when planning roads?

I would like to plan a small road network for an imaginary city, and I am looking for a way to create curved road segments. I am familiar with cubic Bezier curves, but I am not sure if it's the best ...
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32 views

Specific Questions about Traffic Signal Preemption at Grade Crossings

Several questions, regarding traffic signal preemption at a grade crossing Is the preempt relay, which triggers the preemption sequence, located inside the bungalow which houses the grade crossing ...
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2answers
145 views

What is the starting/stopping sequence of a traffic light

As is probably known a traffic light may be turned off in which case normal rules applies to the intersection. While the traffic light is active then red & red+yellow means that drivers are ...
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1answer
110 views

What are the disadvantages of free-flow intersections?

I've recently learned about free-flow intersections. In particular, the DCMI, and the Stack interchanges. What are the disadvantages of using them, compared to the "normal" signaled intersections? do ...
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1answer
151 views

How can traffic signal controllers handle multiple conflicting preemption requests of equal priority without dropping one?

Let us assume that we are North American traffic engineers, and have the (hypothetical, plausible, yet pathological) intersection configuration depicted (not to scale and lacking lane lines, sorry -- ...
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1answer
269 views

What's the purpose of a 'burger' lane in a roundabout?

I recently read about a newly proposed 'burger' lane across a roundabout. burger lane plan http://www.gloucestershirelive.co.uk/images/localworld/ugc-images/276271/Article/images/29745204/15574035-...
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2answers
161 views

How do you call the intersection with barrier and you can always right turn?

In the photo above I can name the first 3 intersection a) Regular intersection b) T intersection c) Skewed intersection I am having a hard time on identifying the fourth intersection, what do you ...
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2answers
123 views

Historically, how did tram switches work?

Historically, the switches on regular railways were switched manually using a lever by dedicated staff to route trains correctly before getting replaced by an automatic electronic system. A similar ...
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1answer
1k views

How are train crossing signals and highway traffic signals coordinated?

Some roadway intersections that are near railroad tracks have signs that light up when a train is approaching. These signs warn that certain turns are not allowed because of the train. One of these ...
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1answer
383 views

When are Single Point Urban Interchanges used?

There is a topic discussing the pros and cons of roundabouts. A less common intersection is the Single Point Urban Interchange (SPUI). This is an intersection that seems to be mostly used on ...
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1answer
223 views

Best traffic control device/system for given situation

I am familiar with the round-a-bout/traffic light pros and cons, however, I've been tasked with deciding on a solution for the given parameters below. Currently, there is a two-way (four lane) road ...