Lewis Lehe
@lewislehe.bsky.social
Asst. Prof at University of Illinois Urbana-Champaign. Traffic, transit and economics. https://lehelab.com/
enjoying gemini 3. no personality, less wordiness than claude.
November 26, 2025 at 1:41 AM
enjoying gemini 3. no personality, less wordiness than claude.
i hope bionic bo will speak up for droid tolerance in Chicago.
November 26, 2025 at 1:10 AM
i hope bionic bo will speak up for droid tolerance in Chicago.
it was prophecied
Lehe & Pandey (2025)
Lehe & Pandey (2025)
November 25, 2025 at 2:32 PM
it was prophecied
Lehe & Pandey (2025)
Lehe & Pandey (2025)
interesting how unintuitive falling aggregate demand is, and how relentlessly appealing the alternative explanations are. when I was young, nobody wanted to work due to video games. now AI Is taking the jobs. China, the extreme case, says it’s “involution.”
November 19, 2025 at 2:13 PM
interesting how unintuitive falling aggregate demand is, and how relentlessly appealing the alternative explanations are. when I was young, nobody wanted to work due to video games. now AI Is taking the jobs. China, the extreme case, says it’s “involution.”
anyone know of an algorithm that makes offsets of overlapping routes like this automatically?
couldn't find anything that did exactly this, so a student is developing one for gtfs.
note in gtfs, the overlapping portions linestrings probably won't be identical.
couldn't find anything that did exactly this, so a student is developing one for gtfs.
note in gtfs, the overlapping portions linestrings probably won't be identical.
November 17, 2025 at 11:53 PM
anyone know of an algorithm that makes offsets of overlapping routes like this automatically?
couldn't find anything that did exactly this, so a student is developing one for gtfs.
note in gtfs, the overlapping portions linestrings probably won't be identical.
couldn't find anything that did exactly this, so a student is developing one for gtfs.
note in gtfs, the overlapping portions linestrings probably won't be identical.
playing around with something.
difference b/w the mpg's of the hybrid vs. the mpg of the regular "gas" version of models w/ both versions.
difference b/w the mpg's of the hybrid vs. the mpg of the regular "gas" version of models w/ both versions.
November 12, 2025 at 7:16 PM
playing around with something.
difference b/w the mpg's of the hybrid vs. the mpg of the regular "gas" version of models w/ both versions.
difference b/w the mpg's of the hybrid vs. the mpg of the regular "gas" version of models w/ both versions.
this is cool. someone out there is very happy.
my.cee.illinois.edu/announcement...
my.cee.illinois.edu/announcement...
November 12, 2025 at 4:28 PM
this is cool. someone out there is very happy.
my.cee.illinois.edu/announcement...
my.cee.illinois.edu/announcement...
always post the same.
happy Veterans Day to surviving borinqueneers 65th infantry.
they had a very tough time at chosin reservoir. even my grandfather, wounded twice in the pacific, found the fighting especially bleak. they were also discriminated against. theres a nice mural in chicago.
happy Veterans Day to surviving borinqueneers 65th infantry.
they had a very tough time at chosin reservoir. even my grandfather, wounded twice in the pacific, found the fighting especially bleak. they were also discriminated against. theres a nice mural in chicago.
November 11, 2025 at 7:34 PM
always post the same.
happy Veterans Day to surviving borinqueneers 65th infantry.
they had a very tough time at chosin reservoir. even my grandfather, wounded twice in the pacific, found the fighting especially bleak. they were also discriminated against. theres a nice mural in chicago.
happy Veterans Day to surviving borinqueneers 65th infantry.
they had a very tough time at chosin reservoir. even my grandfather, wounded twice in the pacific, found the fighting especially bleak. they were also discriminated against. theres a nice mural in chicago.
i don’t know which way causation runs but this is not an accident
November 7, 2025 at 5:29 PM
i don’t know which way causation runs but this is not an accident
(knowing I‘ll be the 100kth person to make this joke)
diva down!
diva down!
November 5, 2025 at 2:47 PM
(knowing I‘ll be the 100kth person to make this joke)
diva down!
diva down!
went to try grok, asking it about Chinese ev subsidy fraud. it made up statistics wholesale.
I went to check the sources it cited. they had been written by LLMs and included quotes from unlinked Bloomberg coverage. but the quotes weren’t in any Bloomberg articles.
I went to check the sources it cited. they had been written by LLMs and included quotes from unlinked Bloomberg coverage. but the quotes weren’t in any Bloomberg articles.
November 4, 2025 at 12:37 AM
went to try grok, asking it about Chinese ev subsidy fraud. it made up statistics wholesale.
I went to check the sources it cited. they had been written by LLMs and included quotes from unlinked Bloomberg coverage. but the quotes weren’t in any Bloomberg articles.
I went to check the sources it cited. they had been written by LLMs and included quotes from unlinked Bloomberg coverage. but the quotes weren’t in any Bloomberg articles.
oxford UK launched its temporary congestion charge today. It is a little complex. Since 2022, there's been a a "zero emission zone pilot" with charges for non ZEVs. the congestion charge is on a several links outside it, but not forming a specific zone.
www.bbc.com/news/article...
www.bbc.com/news/article...
October 29, 2025 at 7:12 PM
oxford UK launched its temporary congestion charge today. It is a little complex. Since 2022, there's been a a "zero emission zone pilot" with charges for non ZEVs. the congestion charge is on a several links outside it, but not forming a specific zone.
www.bbc.com/news/article...
www.bbc.com/news/article...
for comparison, Norway got way richer during the war
October 26, 2025 at 6:12 PM
for comparison, Norway got way richer during the war
opportunity costs. someone should do a counterfactual of Russia’s finances w/o war. asset values soared since 2022. they would’ve deposited more taxes in the fund. they sold half their gold in 2024, before the price surged. a better measure of the cost than the deficit.
October 26, 2025 at 6:10 PM
opportunity costs. someone should do a counterfactual of Russia’s finances w/o war. asset values soared since 2022. they would’ve deposited more taxes in the fund. they sold half their gold in 2024, before the price surged. a better measure of the cost than the deficit.
for weeks I’ve been thinking of ”a few small beers” and laughing quietly. googled and it turns out I’m not alone.
Benicio del Toro is a genius.
Benicio del Toro is a genius.
October 24, 2025 at 8:42 PM
for weeks I’ve been thinking of ”a few small beers” and laughing quietly. googled and it turns out I’m not alone.
Benicio del Toro is a genius.
Benicio del Toro is a genius.
chinese people started buying cars around the time ev's were getting okay, but it wasn't until 2021 that things blew up. there seems to be a moment around 2020 when ev's passed a certain quality level. also explains why their tradein rebates are inexpensive: there aren't many old cars around.
October 21, 2025 at 4:23 PM
chinese people started buying cars around the time ev's were getting okay, but it wasn't until 2021 that things blew up. there seems to be a moment around 2020 when ev's passed a certain quality level. also explains why their tradein rebates are inexpensive: there aren't many old cars around.
people think China subsidizes production of EVs, which get exported. but they only ever gave rebates for domestic sales, and the rebates were halved in 2019 and ended in 2022. the export surge corresponds to the end of the rebate regime.
October 21, 2025 at 3:59 PM
people think China subsidizes production of EVs, which get exported. but they only ever gave rebates for domestic sales, and the rebates were halved in 2019 and ended in 2022. the export surge corresponds to the end of the rebate regime.
electricity becoming more common for heat, as people move south from cold places and use heat pumps. ostensibly the electricity price surge will slow this down.
www.eia.gov/todayinenerg...
www.eia.gov/todayinenerg...
October 20, 2025 at 1:21 PM
electricity becoming more common for heat, as people move south from cold places and use heat pumps. ostensibly the electricity price surge will slow this down.
www.eia.gov/todayinenerg...
www.eia.gov/todayinenerg...
woah that’s wild. you don’t say
October 19, 2025 at 10:08 PM
woah that’s wild. you don’t say
in new @findingspress.org paper, PhD candidate shirin qiam
(now at Minneapolis Met Council). uses a deep learning model and post processing pipeline that outlines surface parking lots. Tulsa has a lot, Oakland surprisingly little.
findingspress.org/article/1452...
(now at Minneapolis Met Council). uses a deep learning model and post processing pipeline that outlines surface parking lots. Tulsa has a lot, Oakland surprisingly little.
findingspress.org/article/1452...
October 15, 2025 at 10:26 PM
in new @findingspress.org paper, PhD candidate shirin qiam
(now at Minneapolis Met Council). uses a deep learning model and post processing pipeline that outlines surface parking lots. Tulsa has a lot, Oakland surprisingly little.
findingspress.org/article/1452...
(now at Minneapolis Met Council). uses a deep learning model and post processing pipeline that outlines surface parking lots. Tulsa has a lot, Oakland surprisingly little.
findingspress.org/article/1452...
you can see the expiring tax credit caused people to buy a lot of BEVs. hybrids fell as a share of vehicles over the summer.
October 15, 2025 at 8:45 PM
you can see the expiring tax credit caused people to buy a lot of BEVs. hybrids fell as a share of vehicles over the summer.
it's surprising to me that a strike would have such a permanent effect. it says on their timeline that they also did a frequent network in 2015.
October 15, 2025 at 5:38 PM
it's surprising to me that a strike would have such a permanent effect. it says on their timeline that they also did a frequent network in 2015.