de_huit · HackerTrans

anno scorsodiscuss

Right. The government facilitates the commercial apps to communicate using the ETSI ITS standards with the traffic lights. For these protocols, lots of privacy discussions have taken place, like using different IDs at every intersection, and even hiding the line number of a bus. This make doing analyses like routing decisions pretty hard using only the public data. But the commercial apps have access to everything...

de_huit

anno scorsodiscuss

Predict the exact traffic situation 32 minutes in the future? Where would the information come from? The actual system in Flanders predicts about 1 minute, and that only for the main arteries. And the system barely uses the info from the vehicles, the main source is induction loops. Only a small percentage of the vehicles send their location, and hardly any cyclist and pedestrians. Vehicles don't send their destination, only the 'turn-intention' on the next intersection. But even that is unreliable, so typically not used.

de_huit

4 anni fadiscuss

I really miss poring over big sheets of paper to find nice routes to cycle over... Especially in France, the Michelin 200.000 maps are unrivaled to not only find your way, but also have a good feel how the road and the landscape looks like. [1].

These Michelin maps have a great feature I've not seen elsewhere: traffic intensity is rendered with color (white=quiet, red=busy) and road-width is rendered as width, binned at a few standard widths. I would love to see that on openstreetmap.

[1] https://www.viamichelin.nl/static/1.462.0/html/michelinmap.h...

de_huit

4 anni fadiscuss

Nice project, and nice map! I did not know the Ferraris map, it is gorgeous.

It would love to see a tile server of this map, preferably with a switch between the old and the new map.

There is a 'time travel app' for Belgium [1] that includes the Ferraris map, and even older maps. It's a bit clunky, I like the Dutch topotijdreis (topo-time-travel) [2] a lot more, but it seems like the maps are not as old and not as good, I have to slide to 1898 to get a colored map of Amsterdam.

[1] https://www.geopunt.be/kaart?app=Reis_door_de_tijd_app

[2] https://www.topotijdreis.nl/kaart/1898/@122079,487387,9.49

de_huit

4 anni fadiscuss

The version from Hacker's delight is fun and does not branch:

  int popcount32(unsigned i) {
    i = i - ((i >> 1) & 0x55555555);
    i = (i & 0x33333333) + ((i >> 2) & 0x33333333);
    i = ((i + (i >> 4)) & 0x0F0F0F0F);
    return (i * 0x01010101) >> 24; 
  }

de_huit

4 anni fadiscuss

An interesting answer to your question from Tailscale a few weeks ago [1]: sqlite as the main database, many readers read a copy, the copies synced using litestream. [1] https://news.ycombinator.com/item?id=30883015&p=2

de_huit

4 anni fadiscuss

The oldest source [1] seems to be in Sanskrit, a left-to-right language, so they were big-endian numbers. This still does not rule out an even older origin in a right-to-left language, but as it stands I'm afraid I was just wrong with my 'little endian origin' story. Too bad, I liked it.

[1] https://mathshistory.st-andrews.ac.uk/HistTopics/Bakhshali_m...

de_huit

4 anni fadiscuss

> Hard disagree, big-endian is right and little-endian is wrong. At least, unless you think this year is 2202

Our numbers originate from people using a right-to-left script...

de_huit

4 anni fadiscuss

There is extra risk of course.

Good ventilation is required through a counter-flow heat-exchange. This typically gives you the problem of too low humidity, as you remove humid air and get condensation in the heat exchange.

There is risk of condensation in the walls. The internal warm layer is airtight, but the walls need to be ably to breath to the outside. Your wood can rot if you make mistakes here, especially on small leaks in the airtight layer. So air-tightness actually is needed to prevent too much condensation in the construction.

This all supposes that warm is inside and cold outside, as is typical where I live. In reverse conditions, with hot humid weather and cooling inside, condensation is likely in the walls, as the airtight layer is on the cold side of the wall now.

So condensation in the construction is unavoidable. I used an online calculator to decide my material use [1] to estimate how often it does happen, and how long it typically takes to dry. Inside my home, I need a humidifier, this winter it was often below 30%.

[1] https://www.ubakus.com/

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