dabreegster

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by dabreegster 6y ago
Only fixed trips coming from https://www.psrc.org/activity-based-travel-model-soundcast . Demand modelling is next -- changes you make to the map will influence existing trips to change mode. The biggest difficulty in simula
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by dabreegster 6y ago
Hi, author here. Previously posted to HN ( https://news.ycombinator.com/item?id=21763636 ). I just released alpha -- check out this cheesy trailer ( https://www.youtube.com/watch?v=LxPD4n_1-LU ). Happy to answe
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by dabreegster 6y ago
I'm working on https://abstreet.org , just for the transportation aspect of city sim. My goal is to make something in between VisSim (proprietary, hard to use, but industry standard) and Skylines (not based on real places or
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by dabreegster 7y ago
I like this as a single aggregate measurement to base scores on. Some of the difficulty comes from displaying this score as the simulation runs through the day. At first the average might look great (a change helps the bus in the early AM),
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by dabreegster 7y ago
This is totally on my radar. I want to compile to wasm and target WebGL. I'm using https://github.com/glium/glium/ to target OpenGL on Windows, Mac, and Linux right now. I've been meaning to check out h
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by dabreegster 7y ago
I'm pulling in trips (when does an agent leave, where do they depart from and go to, what mode of transport do they use) from https://www.psrc.org/activity-based-travel-model-soundcast , which is a very fancy model that
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by dabreegster 7y ago
Creating a [traffic simulation]( https://github.com/dabreegster/abstreet/#ab-street ) that's both realistic enough to generate results meaningful in the real world, but easy enough to use that anybody living in
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by dabreegster 7y ago
Shameless plug for https://abstreet.org . (Importing any city from OSM still needs lots of work, though.)
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by dabreegster 7y ago
It's a bit more of a story to tell offline. In short, the stable money stream quickly leads to a comfortable savings, giving me time to try an experiment like this. Right now I'm motivated by technically interesting projects that
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by dabreegster 7y ago
I've brainstormed with some people about trying reinforcement learning. It's not a direction I'm prioritizing anytime soon, but if you're interested in this, I'm happy to adjust the sim and analysis layer to make th
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by dabreegster 7y ago
I would love this too. https://lidi5.org is the only proposal I know of right now to do some of this
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by dabreegster 7y ago
I've had some trouble getting in touch with the engineers who did this around Seattle. Any details they can share about the software they use, what metrics they base decisions on, where they pull demand data? Any thoughts on making the
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by dabreegster 7y ago
I don't have real traffic signal timing for Seattle. I'm waiting on a reply from some folks at SDOT and King County GIS. In the meantime, I have heuristics like https://github.com/dabreegster/abstreet/blo
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by dabreegster 7y ago
In theory, https://github.com/dabreegster/abstreet/blob/master/docs/new... . There are a bunch of unsolved problems -- for example, most places in OSM don't map on-street parking, so there won&#
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by dabreegster 7y ago
The jam is probably not realistic. Because that area is a divided set of one-way roads, there are a few intersections each tagged with a traffic signal in OpenStreetMap. I'm simulating each signal independently right now. In reality, i
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by dabreegster 7y ago
The professional simulators are prohibitively expensive for individuals to play around with, sadly. I had the chance to try VISSIM recently, and the UI was overwhelming -- the general public would never casually learn to use something that
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by dabreegster 7y ago
I'd like to explore more realistic behavior at some point. Right now, vehicles will avoid starting a turn if there's not enough time left in the signal, but this is an optimistic estimate assuming nobody else is creeping along on
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by dabreegster 7y ago
I wouldn't call the GUI library "nicely modularized" at all. :) I regret rolling my own; the best choice when I started probably would have been https://github.com/Gekkio/imgui-rs . Recently iced has appe
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by dabreegster 7y ago
I started the project while I was working at Google, went through the open source process, and then left a short while after to work on it full-time. There's no affiliation with Google.
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by dabreegster 7y ago
Hi, author here! Didn't intend for this to wind up on HN quite yet, but I'm excited to answer the good questions coming up here.