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OK so by "across the Baltic" I meant crossing it from east to west or vice versa. But sure, short trip ferries are often passenger-only and then a speed boat make sense. They can be reasonably efficient in terms of CO2 per passenger mile, as well. For Macau to Hong Kong, that's just across the harbor basin, isn't it? You don't take that kind of boat across open seas. And of we're taking a ship on a 6-12 hour trip, passengers will want a cabin and beds, and then we're suddenly talking about transporting a whole hotel and parking garage across the sea.
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Feb 9, 2023 12:43
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There's an area near where I live that drives me batty during high traffic times. It looks like this: Both intersections are four-way stops, which means that the overpass is routinely backed up from one intersection to the other. And there's three lanes of traffic feeding into that one backed-up lane. As a consequence, you are pretty much forced to go into the intersection before there's space for you in the backed-up lane; if you wait, some other rear end in a top hat will shove their way in even though it's not their turn yet. And that means that people going in other directions through this intersection can't get through, because there's cars sitting in the middle of it, not moving. Is this even solvable without a massive restructuring of the area?
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Mar 9, 2023 18:06
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TooMuchAbstraction posted:Is this even solvable without a massive restructuring of the area? Traffic signals
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Mar 9, 2023 18:19
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"Raindrop-roundabouts" could be an option, but there may not be enough space and I'm not sure if they have enough capacity.
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Mar 9, 2023 18:32
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Saukkis posted:"Raindrop-roundabouts" could be an option, but there may not be enough space and I'm not sure if they have enough capacity. Is there a gas station that the County would have to buy if we built this roundabout? If yes, do not build that roundabout. In this case, do not build two roundabouts. Edit: Service center, but same deal
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Mar 9, 2023 18:34
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Yeah, there's a gas station/service center combo on one corner (abutting a shopping center), and a beloved* fifty-year-old pastry shop on another. I can't imagine the county is in a big hurry to tear up buildings in order to improve traffic flow.Devor posted:Traffic signals This is the easy answer, but I'm not convinced it'd actually work. I mean, I get the theory: line up the lights so that cars can flow freely across the overpass. But is there actually a configuration of light timings that would achieve that? The whole "three lanes feeding into one lane" thing, plus the need to handle the not-insignificant traffic that isn't going across the overpass, makes it sound to me like moving to a lights system would require very long wait times. Honestly, if there was some way to just force drivers to wait for their turn instead of seizing the first instance where they can shove their way in without someone else stopping them, the intersections would be fine. Slow, but fine. Maybe the answer is to station a traffic cop there during rush hour  * I don't really get why they're so popular, but I can't deny they are 
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Mar 9, 2023 18:47
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TooMuchAbstraction posted:This is the easy answer, but I'm not convinced it'd actually work. I mean, I get the theory: line up the lights so that cars can flow freely across the overpass. But is there actually a configuration of light timings that would achieve that? The whole "three lanes feeding into one lane" thing, plus the need to handle the not-insignificant traffic that isn't going across the overpass, makes it sound to me like moving to a lights system would require very long wait times. They'll operate better than having stop-controlled intersection. It wouldn't be a standard timing due to the proximity of the two signals, and each signal won't reach the capacity that a single one could be expected to serve, but it would be better than it is now. The better flow might attract more traffic and end up performing worse, but that's hard to know in advance. You could also consider fixes that would improve operations like restricting certain turning movements, during rush hour or all day. It can be tricky to avoid making your problem worse with that sort of change, since folks in urban areas can just go around the block.
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Mar 9, 2023 18:56
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Paint in the world's smallest, most MacGuyver'd diverging diamond
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Mar 9, 2023 19:27
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Anyone on this thread work in California? I heard recently that Caltrans transitioned from using level of service to vehicle miles traveled in assessing projects/developments and interested to know any perspective on how successful that has been
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Mar 9, 2023 19:52
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How do you design the path that a curved road should take? Do you use splines? Bezier curves? How many levels of continuity do you care about?
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Mar 10, 2023 23:27
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VostokProgram posted:How do you design the path that a curved road should take? Do you use splines? Bezier curves? How many levels of continuity do you care about? https://www.blipshift.com/products/track-magnets
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Mar 11, 2023 05:24
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Lobsterpillar posted:Anyone on this thread work in California? I heard recently that Caltrans transitioned from using level of service to vehicle miles traveled in assessing projects/developments and interested to know any perspective on how successful that has been delays in going through intersections are no longer considered an "environmental impact" that needs to be studied and mitigated, so that's good! infill development no longer has to widen intersections to comply with the California Environmental Quality Act. (Cities can still just make them do it if intersection level of service standards are found in their local regulations, though.) what's bad is VMT mitigation is fake, stupid, and everywhere. exurbs are still subdividing and sprawling for people to live 50 miles from work and mitigating the VMT with poo poo like "we're having them paint bike lanes green," or "we're going to have sidewalks." The intent was that VMT is impossible to mitigate, so the impact of building sprawl on VMT is significant and unavoidable, so people would stop loving doing it. But CEQA is not laws; it's just a requirement to study things. The way to fix that bridge in Greg12 fucked around with this message at 16:22 on Mar 13, 2023 |
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Mar 11, 2023 15:56
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VostokProgram posted:How do you design the path that a curved road should take? Do you use splines? Bezier curves? How many levels of continuity do you care about? Standard road construction is just Tangent-Curve-Tangent. Curve geometry maximum/minimum radius is governed by AASHTO Roadway Design Guide (Green book) Some jurisdictions will use spirals on high-speed roads - often just a standard spiral length. So, Tangent-Spiral-Curve-Spiral-Tangent, where the curve in the middle follows the same restrictions as T-C-T, plus 100-foot long spirals. All the big design software packages (Geopak, Inroads, Civil3D) have drafting tools that assist with laying out alignments. It typically lets you lock in and specify stuff like bearings, radius, tangent curves, etc... it's pretty flexible.
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Mar 11, 2023 18:59
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When you say curve, do you then mean an arc of a circle? As opposed to any other curved shape you can define with a mathematical function. (In video games it seems to be more common to use Bezier curves or B-splines to lay out roads etc, with the Transport Fever games being the exception which instead uses circle arcs for railroad and road curves.)
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Mar 11, 2023 19:27
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nielsm posted:When you say curve, do you then mean an arc of a circle? As opposed to any other curved shape you can define with a mathematical function. Yes, curve is just the arc of a circle. Railroads are the exception that use the gently caress out of spirals (a spiral just being a variable-radius curve as I understand it).
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Mar 11, 2023 20:22
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What's the reason to use a spiral curve? I guess I can see some utility in easing into the curve instead of having to suddenly apply a certain amount of steering, but is there anything beyond that?
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Mar 12, 2023 01:50
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TooMuchAbstraction posted:What's the reason to use a spiral curve? I guess I can see some utility in easing into the curve instead of having to suddenly apply a certain amount of steering, but is there anything beyond that? No, that's it. For cars, you have enough play of the narrower vehicle within the wider lanes that it's not really necessary to make the geometry complicated just to shift lane lines around a few inches. Trains use spirals because the track geometry *is* the steering, so a Tangent-Curve transition would create little instantaneous stresses on the carriages.
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Mar 12, 2023 19:10
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Euler spirals/clothoids are mandatory are mandatory in Dutch highway design and have been since forever IIRC. The rest is just tangents and circle arcs yeah. I find it way more relaxing to do a 1:1 build of AASHTO-designed stuff in Cities Skylines since I can simply glue the arcs together after going through the metric conversion.
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Mar 12, 2023 20:29
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TooMuchAbstraction posted:There's an area near where I live that drives me batty during high traffic times. It looks like this: 
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Mar 13, 2023 03:24
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Saukkis posted:"Raindrop-roundabouts" could be an option, but there may not be enough space and I'm not sure if they have enough capacity. yeah this edit: the wild part is that Manor Dr is the only street that crosses the Cabrillo Hwy for like a mile, so maybe fix that bottleneck too while you're at it. Peanut President fucked around with this message at 03:32 on Mar 13, 2023 |
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Mar 13, 2023 03:27
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I'm taking this to read as "left turns are forbidden"; is that the intended reading? The ramifications of that change on the nearby streets sure would be entertaining!
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Mar 13, 2023 03:41
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TooMuchAbstraction posted:I'm taking this to read as "left turns are forbidden"; is that the intended reading? The ramifications of that change on the nearby streets sure would be entertaining! 
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Mar 13, 2023 04:05
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 carmel indiana uses dogbones for their exit ramps and it's fundamentally the same (only it's 2 way roads on the sides instead of 1 lane ramps)
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Mar 13, 2023 04:10
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Ahh, gotcha, thanks for the clarification!
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Mar 13, 2023 04:22
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lol
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Mar 30, 2023 17:07
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Or just drive faster to avoid getting stuck on them
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Mar 30, 2023 17:19
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Why do I get the feeling that the solution to this "problem" will be SUVs with the ground clearance of monster trucks?
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Mar 30, 2023 18:09
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Hippie Hedgehog posted:Why do I get the feeling that the solution to this "problem" will be SUVs with the ground clearance of monster trucks? Can we skip the intermediate steps and just have everyone drive actual monster trucks?
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Mar 30, 2023 18:13
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I'm pretty sure my 90s van could clear that thing if I angled it right, but why would anyone do that instead of just driving in between them in the middle?
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Mar 31, 2023 00:47
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Javid posted:I'm pretty sure my 90s van could clear that thing if I angled it right, but why would anyone do that instead of just driving in between them in the middle? They aren’t well marked and people aren’t expecting them
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Mar 31, 2023 01:27
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I had to google it to figure out what the setup even is, since the angle+lack of signs in the pic isn't very useful & my american rear end has never seen one before. Apparently the idea is that only one direction of traffic at a time can go through these, so people turning onto slower streets are forced to slow down and possibly wait. People have also gotten semi trucks through without issue, so they're not that tight of a fit. I also found people theorizing that the car in this specific pic reversed onto it, which makes it an even dumber move than I expected.
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Mar 31, 2023 02:27
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Haifisch posted:I had to google it to figure out what the setup even is, since the angle+lack of signs in the pic isn't very useful & my american rear end has never seen one before. Apparently the idea is that only one direction of traffic at a time can go through these, so people turning onto slower streets are forced to slow down and possibly wait. People have also gotten semi trucks through without issue, so they're not that tight of a fit. I haven't seen something like this specifically, but some other attempts to narrow the road artificially. They're wide enough that it does nothing to slow me down unless there's traffic in the opposite direction, when you might have to stop. Better than speed bumps I guess?
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Mar 31, 2023 08:53
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To narrow it to one direction at a time, over here we just build local roads 7-9m wide (~23-30 ft) and a couple parked cars does the rest. Definitely something we should do more of on some streets but some people have a fit over the fact that nobody has right of way.
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Mar 31, 2023 09:36
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Devor posted:They aren’t well marked and people aren’t expecting them Eh, they're in hi-vis yellow, that should be plenty in terms of marking. Maybe add reflectors? But yeah, people aren't expecting them, for sure. The design also doesn't make it clear to a driver that "this is an intentional narrowing of the street". I'm sure alternative designs, like narrowing by extending the curb, are more costly. This was probably plopped down in 10 minutes. There is something to be said for using familiar design elements, following construction manuals, etc. Haifisch posted:I also found people theorizing that the car in this specific pic reversed onto it, which makes it an even dumber move than I expected. Yeah, I bet they were reversing around the corner and being a driver of a big stupid SUV, they have 0 visibility of low objects behind them. And having never seen something like this (basically a hi-vis Jersey barrier in the middle of the road), even if they were watching their rear-view camera, they will have failed to recognize what it is, how tall it is, etc. The way they're stuck also points toward a medium-speed reversal. If they were going forward, they would have to have travel at quite some speed in order to grind the rail that far, and then the driver would have had to be very distracted or quite blind. Edit: https://www.kidsandcars.org/how-kids-get-hurt/backovers/ posted:
Hippie Hedgehog fucked around with this message at 10:03 on Mar 31, 2023 |
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Mar 31, 2023 09:58
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it's mindboggling that carbrains get mad that the mean old city put traffic calming measures in the street instead of realizing what would have happened had that quik-chicane been a child
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Mar 31, 2023 14:58
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This made me think of the Michigan lefts they added to an intersection in Plano Texas which got people so confused they just gave up and let people turn at the cross road 
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Mar 31, 2023 17:00
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That type of traffic calming is really common in my country both in residential areas and on minor suburban roads, especially with roads that were formerly through roads but needed to be slowed down. The idea is indeed that traffic is calmed by having to watch for and occasionally wait for opposing traffic. You can still tear through it if you try hard enough, but of course all the weaving required also is supposed to be a signal to calm down a bit. Sometimes there are multiple of them in sequence. Example: https://goo.gl/maps/mA8DvX7PmjpbH5AX6 Or sometimes it's done by blocking one side of the road, in this case multiple times to force weaving: https://goo.gl/maps/WixfTcnnuoJVeByX8
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Mar 31, 2023 19:48
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Haifisch posted:I had to google it to figure out what the setup even is, since the angle+lack of signs in the pic isn't very useful & my american rear end has never seen one before. Apparently the idea is that only one direction of traffic at a time can go through these, so people turning onto slower streets are forced to slow down and possibly wait. People have also gotten semi trucks through without issue, so they're not that tight of a fit. these things are called chicanes https://www.sfbetterstreets.org/find-project-types/pedestrian-safety-and-traffic-calming/traffic-calming-overview/chicanes/ the point of them is to enforce slower speeds on a street by making the driver pay attention lest they hit a curb and gently caress up their vehicle. speed limits you have to enforce, but a big curb that fucks up your car enforces itself. it looks like this particular one necks a side street down to one way only for a brief distance so as to cause drivers to have to slow down rather than just blowing through and ignoring signage an SUV perched on top of one of these things is definitely a "that is what it is supposed to do" level moment. pay attention or gently caress up your car, simple as Mr. Fall Down Terror fucked around with this message at 20:31 on Mar 31, 2023 |
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Mar 31, 2023 20:28
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Hippie Hedgehog posted:Eh, they're in hi-vis yellow, that should be plenty in terms of marking. Maybe add reflectors? Yeah they're pretty new in Vancouver, where this happened. My understanding from the City planners/engineers is that they're piloting new forms of traffic calming. The current default is for residents to request speed humps on their street, but that isn't the most effective or efficient means. (They were also all-in on small roundabouts at intersections as a calming measure until a local group published a study showing that those were massively hazardous, especially for cyclists.) They're also in principle trying to reduce all side streets to 30km/h, but obviously just putting up signs doesn't work, so they're not even bothering, and are instead setting up streets so that drivers just don't speed. These are part of the new toolkit for that, and people aren't used to them, but should be soon.
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Apr 1, 2023 20:46
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Ireland.
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Apr 5, 2023 17:42
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