5
votes
What kind of splines should be used when planning roads?
Roads are usually designed using catenary curves. https://sketchup.engineeringtoolbox.com/catenery-curve-c_169.html
Road curves are designed around vehicle velocities and they are not uniform. As ...
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5
votes
What kind of splines should be used when planning roads?
Circular arcs are not used except in special situations, because the sudden change in curvature from a straight road to a circular arc would mean drivers had to quickly turn the steering wheel to the ...
- 12.6k
3
votes
What is the starting/stopping sequence of a traffic light
What country? This is different between different countries.
I can give the sequence in Poland, which is standard in most of EU.
180 seconds of Blinking Yellow. (Groups [**] with Yellow blink ...
- 6,115
2
votes
What's the purpose of a 'burger' lane in a roundabout?
Another purpose of such a lane is to allow for vehicles that cannot navigate the roundabout to travel through.
For example a tram's turning radius may not allow them to drive around the roundabout so ...
- 6,281
1
vote
Accepted
"Burger" lanes: What are they, where are they found, and what do they look like?
if your question is how they look like then:
figure: source hulldailymail
or
figure: source openstreet wiki
They are also known as "through roundabouts"
As to their name I suppose that ...
- 24.3k
1
vote
What kind of splines should be used when planning roads?
Clothoid?
I recall hearing that some roadway curves are designed using the Clothoid Spiral AKA the Spiral of Cornu AKA https://en.wikipedia.org/wiki/Euler_spiral
in which the (radius of) curvature ...
- 161
1
vote
What is the starting/stopping sequence of a traffic light
There is another state the lights can be in: blinking yellow. Which means that the intersection is not being controlled and normal priority rules are in force. Going from off to all blinking does not ...
- 6,281
1
vote
How can traffic signal controllers handle multiple conflicting preemption requests of equal priority without dropping one?
As you might well imagine, there is a metric f-ton (the technical term :-) ) of research covering both queuing theory and prioritization analysis.
The correct, if unsatisfying answer to your ...
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