New UC-Davis primer on induced demand: "Studies arrive at the same conclusion: the long-term elasticity of VMT w.r.t. lane miles centers around 1.0. This means that a 10% increase in lane miles is likely to increase VMT by 10% in the long run (within 3 -10 years)." escholarship.org/content/qt0k... - ThreadSky

davidzipper.bsky.social • 46 days ago

New UC-Davis primer on induced demand:

"Studies arrive at the same conclusion: the long-term elasticity of VMT w.r.t. lane miles centers around 1.0. This means that a 10% increase in lane miles is likely to increase VMT by 10% in the long run (within 3 -10 years)."

https://escholarship.org/content/qt0kj840w2/qt0kj840w2_noSplash_98a302e4a4df35efd951177da0374a77.pdf

Comments

kklevine.bsky.social•46 days ago

This is a more stable link: https://doi.org/10.7922/G2GQ6W4Q

gspeng.bsky.social•46 days ago

📌

davidzipper.bsky.social•46 days ago

IMO induced demand is among the most crucial ideas in transportation policy -- and one of the hardest for the average person to grasp.

Hard to overcome the seductive intuitiveness of "wider road is faster road."

https://www.bloomberg.com/news/features/2021-09-28/why-widening-highways-doesn-t-bring-traffic-relief

grquetin.bsky.social•46 days ago

I've gotten local push back from transportation that accepts induced demand but only for freeways as that is where most of the evidence is from. Thoughts?

r343l.bsky.social•46 days ago

If widening freeways results in more demand, what would be the mechanism by which widening a local or non-freeway road also wouldn't? If anything there is also evidence that freeway widening causes downstream demand on connecting local roads (congestion & push for more lanes / bigger ramps).

grquetin.bsky.social•46 days ago

This argument has not gotten me to where I want to be. To be fair we are arguing about whether adding more connections (i.e. grids) will increase demand, but another road seems the same as a wider road to me. (my stance is why not non-car connections?).

riocobre.bsky.social•46 days ago

Parking and Inducted Traffic

https://journals.sagepub.com/doi/abs/10.3141/2543-19

grquetin.bsky.social•46 days ago

Thank you!

bikehfxlobby.bsky.social•46 days ago

📌

arudwick.bsky.social•46 days ago

Does this mean we can get traffic reduction just by reducing lane miles or does it only work in one direction?

mindstalk.bsky.social•42 days ago

Yes, you can

jklyou.bsky.social•46 days ago

From an air quality/transportation conformity standpoint, what’s really important is induced diesel vehicle demand. Got any research on that?

mindstalk.bsky.social•42 days ago

Why? Cars produce lots of pollution too, even electric ones. And what's conformity here?

jklyou.bsky.social•42 days ago

The Clean Air Act has a provision for areas out of compliance with air quality regulations that's called "Transportation Conformity." Showing increases in heavy-duty diesel truck traffic can stop projects. Showing increases in car traffic doesn't. I know it doesn't make sense but that's the law.

gspeng.bsky.social•46 days ago

📌

amendez.bsky.social•46 days ago

Anybody know if “lane miles” includes intersection widening?

bfryback.bsky.social•46 days ago

if it adds a turn lane, yes

amendez.bsky.social•46 days ago

Is that in one of the papers? Oregon CFEC and Bend’s TSP regulate widening but I think staff has interpreted it to only apply to entire corridors and not intersections. Would love to pass anything on to them!

bfryback.bsky.social•46 days ago

To me, "lane mile" counts every lane, including turn and auxiliary lanes. There's probably an official definition somewhere.

avantidomani.bsky.social•46 days ago

📌

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