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Evan Siroky

@evansiroky.bsky.social
209 followers 196 following 179 posts

Dad, Transit Data at Caltrans (posts not representative of my employer), YIMBY, multimodal transport, timezone mapper, OpenStreetMap enthusiast, skiing.

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Evan Siroky @evansiroky.bsky.social · 11/08/2026
SacRT didn't send out a bus bridge cancellation notice, so I ended up biking from Sunrise to Folsom, but the train would've saved only a couple minutes. Moral of the story is maybe I should just always take whatever train to Sunrise/Folsom and bike if I have to.
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Evan Siroky @evansiroky.bsky.social · 24/07/2026
I saw a SacRT Gold Line that said Sunrise in downtown and thought I might as well take it in case there's a bus bridge after Sunrise. Sure enough, I'm on the bus bridge now.
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Evan Siroky @evansiroky.bsky.social · 17/07/2026
I'm waiting at Sunrise for the Gold Line bus bridge to Folsom. I talked to the fare inspectors who said that there is a poor relay or something and a train had its AC catch on fire while idling. So they are preemptively doing bus bridges whenever it gets warm so they don't lose more trains.
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Evan Siroky @evansiroky.bsky.social · 10/07/2026
Yikes, San Joaquin RTD is uh going through some things: stocktonia.org/news/transpo...
stocktonia.org
RTD names another acting CEO amid scrutiny from Stockton officials - Stocktonia News
San Joaquin Regional Transit District named Eric Williams as acting chief executive officer Wednesday, another sudden leadership change at a bus agency already under scrutiny from riders, former offic...
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Evan Siroky @evansiroky.bsky.social · 03/06/2026
There's some TIDES data over here: tides.dds.dot.ca.gov
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Evan Siroky @evansiroky.bsky.social · 07/05/2026
timezone-boundary-builder and node-geo-tz have been released with 2026b data.
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Evan Siroky @evansiroky.bsky.social · 28/04/2026
My train this morning was on time, definitely not 15 minutes late. 🏃‍♂️💨
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Kurt Raschke @kurtraschke.com · 04/04/2026
Need to go from geographic points to time zone identifiers in @clickhouse.com? With @evansiroky.bsky.social's time zone boundary shapefiles and ClickHouse's support for polygon dictionaries, it's fast and easy: kurtraschke.com/2026/04/clic...
kurtraschke.com
Highly efficient timezone lookups using a ClickHouse polygon dictionary
I use ClickHouse for a wide range of data projects, and I recently needed to go from geographic coordinates to the time zone identifier for the time zone observed at those coordinates. The set of loca...
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Evan Siroky @evansiroky.bsky.social · 20/03/2026
I learned of a possible transit data quality problem that I decided to go investigate in person yesterday.
Some screenshots claiming that a bus route has moved to a different nearby stop, but Google Maps is still showing that the bus should stop at the supposedly closed stop.
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Evan Siroky @evansiroky.bsky.social · 11/02/2026
The plans for the Sacramento Station District look really cool: www.cityofsacramento.gov/content/dam/...
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Evan Siroky @evansiroky.bsky.social · 13/01/2026
timezone-boundary-builder and node-geo-tz have been released with 2025c data.
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Evan Siroky @evansiroky.bsky.social · 05/01/2026
Solid storm this weekend
View from a chairlift with snowy weather
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Evan Siroky @evansiroky.bsky.social · 03/01/2026
I'm wondering whether the Asia/Hanoi timezone needs to be constructed using Open Historical Map data.
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Hunter Owens @hunterowens.net · 02/01/2026
New Year: New Job? I'm hiring two Transit Data Scientists to work on SB125 and other transit programs with me at CalSTA calcareers.ca.gov/CalHrPublic/...
calcareers.ca.gov
SB125 Transit Data Scientist
Looking to make a difference? Join our strong and mighty workforce. We offer benefits and growth opportunities and impact the lives of millions of Californians.
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Jason Rabinowitz @airlineflyer.net · 02/01/2026
I have said this before, but I do wish one prominent tech YouTuber would do a BTS tour with a transit agency, showing off all the tech that makes its stuff work. Even just the various systems on a bus today is wild. It'd go a long way to help the image of public transit.
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Evan Siroky @evansiroky.bsky.social · 15/09/2025
timezone-boundary-builder milestone: 1000 GitHub stars
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The Onion @theonion.com · 08/05/2025
City Councilman Unearths Magical Zoning Amulet theonion.com/city-co...
City Councilman Unearths Magical Zoning Amulet
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Ryan Packer @typewriteralley.bsky.social · 09/04/2025
The WA House just approved SB 5501, which prohibits employers from requiring driver's licenses as a condition of employment, unless driving is an essential function of the job. It passed 61-36. This bill is headed to the Governor's desk! app.leg.wa.gov/billsummary/...
app.leg.wa.gov
SB 5501 Washington State Legislature
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Evan Siroky @evansiroky.bsky.social · 31/01/2025
Sad state of affairs in transportation safety.
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Evan Siroky @evansiroky.bsky.social · 30/01/2025
This new administration is putting safety as its last priority.
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Reuters @reuters.com · 28/01/2025
About 35,000 feet over the Mojave Desert, northwest of Los Angeles, Boom Supersonic's XB-1 became the first privately funded airplane to break the sound barrier during a test flight reut.rs/3E9xfO4
reut.rs
Boom Supersonic XB-1 breaks sound barrier over Mojave Desert
About 35,000 feet (10,670 meters) over the Mojave Desert, northwest of Los Angeles, Boom Supersonic's XB-1 became the first privately funded airplane to break the sound barrier during a test flight on Tuesday.
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Evan Siroky @evansiroky.bsky.social · 28/01/2025
I'm not getting worked up about this one at all. I've known for a while that Google Maps invests a lot in localization to the extent of even drawing borders differently based on where a device accesses Google Maps from.
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Evan Siroky @evansiroky.bsky.social · 28/01/2025
The SF Bay area is aging. Map from MTC's 2024 Coordinated Plan: mtc.ca.gov/digital-libr...
Map of percent change in older adult population in San Francisco Bay Area from 2010-2022. Shows most of the bay had an increase in older adults.
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Max Dubler 🏳️‍🌈 @maxdubler.com · 24/01/2025
The people colluding to create housing shortages in order to jack up the price of homes and rent are mostly single family homeowners, not nefarious corporate actors; and they’re doing it in public at your local planning commission, not in smoke-filled conference rooms or whatever.
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Evan Siroky @evansiroky.bsky.social · 23/01/2025
Good article summarizing some of the executive orders that may impact transit from @apta-info.bsky.social. aptapassengertransport.com/president-tr...
aptapassengertransport.com
President Trump Sworn into Office, Issues Significant Executive Orders - Passenger Transport
On Jan. 20, Donald Trump was sworn into office as the 47th President of the United States. On that day, he issued a record-setting 26 Executive Orders (EOs) to immediately advance his Administration’s...
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Edward Russell @byerussell.com · 22/01/2025
Trumps executive orders "could imperil billions of dollars in funding for projects that states have already begun working on... for everything from roads and bridges to broadband and withstanding the effects of climate change." This could get messy. h/t @yfreemark.bsky.social
politico.com
Trump kicks off potentially messy fight over Biden’s infrastructure money
One of Trump's executive orders could imperil billions in funding for projects that states have already begun working on, some experts said.
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Evan Siroky @evansiroky.bsky.social · 22/01/2025
OpenStreetMapping intensifies... if I can figure out how to add this as a custom layer.
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Evan Siroky @evansiroky.bsky.social · 21/01/2025
timezone-boundary-builder release 2025a is now live: github.com/evansiroky/t...
github.com
Release 2025a · evansiroky/timezone-boundary-builder
Zone Changes Update to latest OSM data
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Evan Siroky @evansiroky.bsky.social · 20/01/2025
One of these days I may need to go to Doklam myself to figure out what timezone they really observe over there.
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Evan Siroky @evansiroky.bsky.social · 17/01/2025
BlueSky hasn't fully arrived yet. Nobody seems to have mentioned today's 2025a timezone database release.
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Evan Siroky @evansiroky.bsky.social · 16/01/2025
There's probably a esoteric reason for why this construction project has left a tiny portion of the previous building's outside wall intact.
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California YIMBY @cayimby.bsky.social · 16/01/2025
We are thrilled to announce SB 79, a new bill from @scottwiener.bsky.social that will legalize multi-family housing near transit. We are excited to co-sponsor this landmark legislation with SPUR, @streetsforall.org and the Bay Area Council.
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Evan Siroky @evansiroky.bsky.social · 15/01/2025
I think there's something to be said about how there's too much process to get infrastructure and housing projects approved, but this seems like a pendulum swinging too far in the direction of deregulation when potentially even safety precautions are thrown out the window.
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Evan Siroky @evansiroky.bsky.social · 15/01/2025
Starting to wonder if I should limit my kids from watching certain PBS kids shows like Nature Cat or Wild Kratts. Too many times there are villains that are trying to build homes.
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Evan Siroky @evansiroky.bsky.social · 14/01/2025
Diridon Station conceptual designs on display in Diridon Station.
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Matthew Gertz @mattgertz.bsky.social · 13/01/2025
Climate change is real and getting worse, so we're eliminating red tape to rebuild low-density homes in high-risk areas (and requiring insurance sales) while retaining the regulations for high-density structures in low-risk areas and for clean energy production and transmission.
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Evan Siroky @evansiroky.bsky.social · 13/01/2025
Went skiing at Dodge Ridge. Decided to make a side trip to Sacramento on the way home. Taking a bus from Stockton.
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Daniel Swain @weatherwest.bsky.social · 09/01/2025
Is there a link between #ClimateChange & increasing risk/severity of #wildfire in California--including the still-unfolding disaster? Yes. Is climate change the only factor at play? No, of course not. So what's really going on? [Thread] #CAfire #CAwx #LAfires iopscience.iop.org/a...
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Catenary @catenarymaps.org · 08/01/2025
Los Angeles wildfire boundaries via Catenary right now. Stay safe out there.
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Zae @zaelyna.bsky.social · 08/01/2025
Free Big Blue Bus transporting people from Palisades and Santa Monica to the Westwood Rec Center! www.santamonica.gov/blog/palisad... Pick-up locations: - Ocean Ave + San Vicente Blvd - 7th St + San Vicente Blvd #PalisadesFire #LosAngeles #CAwx
santamonica.gov
Palisades Fire Updates
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KTLA 5 @ktla.com · 07/01/2025
KTLA's @GeneKangTV reports from the perimeter of the #PalisadesFire where crews needed to clear vehicles using a bulldozer to make access for firefighters. Live coverage: trib.al/tBDjKJ0
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Evan Siroky @evansiroky.bsky.social · 06/01/2025
Wow, no California state deficit this year! apnews.com/article/cali...
apnews.com
California governor proposes $322B budget with no deficit
California Gov. Gavin Newsom has proposed a $322 billion budget without a deficit. It’s a welcome change after two years of significant budget shortfalls in the nation’s most populous state.
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Evan Siroky @evansiroky.bsky.social · 05/01/2025
Yikes, I hope everyone in SoCal gets through this ok.
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Ned Resnikoff @resnikoff.bsky.social · 05/01/2025
tl;dr if you already have a housing shortage, then raising the median income will actually *cause* homelessness. The only way out of this trap is to ensure that housing production keeps pace with wage growth.
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Evan Siroky @evansiroky.bsky.social · 05/01/2025
I'm concerned I'm turning off my 4 year old to statistics since he's lost his first two coin toss battles with his sister to decide who gets something they both want.
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Tom Flood @tomflood.bsky.social · 05/01/2025
I’m fine with limiting the speed of e-scooters and e-bikes just as long as we do the same for every vehicle on our roads.
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Man in Business Suit Levitating @dfeldman.org · 03/01/2025
Life was more complicated before time zones
COMPARATIVE TIME-TABLE,
SHOWING THE TIME AT THE PRINCIPAL CITIES OF THE UNITED STATES.
COMPARED WITH NOON AT WASHINGTON, D. C. There is no "Standard Railroad Time» in the United States or Canada; but each railroad company adopts independently the time of its own locality, or of that place at
which its principal office is situated.
The inconvenjence of such a system, if system it can be called, must be apparent to
all, but is most annoying to persons strangers to the From this cause many miscalculations and misconnections have arisen, which not unfrequently have been of serious consequence to individuals, and have, as a matter of
course, trot to tellie, to all gree, thiano, in A me estate, o loa
sent the following table of local time, compared with that of Washington, D. C.
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Kirsten Lum @machsci.bsky.social · 02/01/2025
Don’t think of it as whether the data has error or not. Most of the time it will. Think of it as whether the error in the data will cause you to make a different decision than if the data was perfectly clean. Most of the time it won’t.
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Evan Siroky @evansiroky.bsky.social · 01/01/2025
I have a hobby of correcting people when they say EDT or PDT when most people are actually observing EST or PST. However each time I see the opportunity to do so, I have to double check which one is actually happening at the moment.
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