UPDATE How many meters between emergency exists in metro tunnels? Madrid: 1000m Italy: 900m *cross-passages between bores: 300m* France: 800m NFPA 130: 762m (2,500ft) *cross-passages between bores: 244m (800 ft)* Germany, Austria: 600m Seattle: 244m - ThreadSky

chittimarco.bsky.social • 13 days ago

UPDATE

How many meters between emergency exists in metro tunnels?

Madrid: 1000m

Italy: 900m
*cross-passages between bores: 300m*

France: 800m

NFPA 130: 762m (2,500ft)
*cross-passages between bores: 244m (800 ft)*

Germany, Austria: 600m

Seattle: 244m

Comments

george.borkbork.ca•13 days ago

Although to be fair, 250m is a lot of walking for the average American…

chittimarco.bsky.social•13 days ago

Interestingly, Spain seems to have the less nationally consistent set of fire safety regulations for metros, with multiple decrees and "guìas tecnicas" for mainline rail informally used for metros, NFPA 130 often used as a reference and local + agency-specific guideline.

stephenjacobsmith.com•13 days ago

That is very interesting because Spain has some of the most readable building codes in Europe (and certainly it is nationally unified, though everywhere outside of the DACH countries and the UK seems to be)

samuelpet.bsky.social•13 days ago

Another interesting metric might be how frequently track connections (between two bores) are desired.

In Hamburg for example it seems to be every two stations, with a turning track every four stations, not sure about best practices elsewhere.

chittimarco.bsky.social•13 days ago

That's much more difficult to track because it's not a regulatory requirement but rather a design choice or ingrained design assumption, which is often very city or system-specific

samuelpet.bsky.social•13 days ago

Makes sense, it’s related to operations and less so to safety.

slucy.bsky.social•13 days ago

Give it a couple more years and all tunnels will be required to be lined with continuous emergency exit doors.

chittimarco.bsky.social•13 days ago

that lead to another tunnel, which itself has continuous emergency exists doors leading to another tunnel, which itself has...etc etc etc

searyanc.dev•13 days ago

And people say fractals don't have any practical applications

sck90.bsky.social•13 days ago

To our defense 800 feet sounds like it’s close to 1000m. At least to us Americans. Lol

nicksattele.bsky.social•13 days ago

What’s the 244m example in Seattle? afaik, the bore from Capitol Hill to University of Washington (2 miles) doesn’t have an emergency exit

chittimarco.bsky.social•13 days ago

Seattle's fire code forces to use only cross passages between bores.

nicksattele.bsky.social•13 days ago

Oh I see every 244m is a cross passage

egoldwyn.bsky.social•13 days ago

bellevue tunnel has an emergency fire door

nicksattele.bsky.social•13 days ago

I’m assuming Bellevue has a separate fire code too

egoldwyn.bsky.social•13 days ago

The door was added after the tunnel had been built to NFPA 130 and Bellevue code…

woolie.meowmeow.city•13 days ago

We need emergency exits every 25m just to be sure.

*this post sponsored by WSP, your trusted partners in infrastructure delivery.

bluebookvalue.bsky.social•13 days ago

Each emergency exit requires a full length mezzanine

ellenteapot.ca•13 days ago

“If we’re going to build all that, can’t we just make it an actual station?”

“Absolutely not”

turini2.bsky.social•13 days ago

Interestingly, Crossrail was originally designed with intervention shafts every 1km … community pushback and more cross passages meant that many of them were dropped

https://www.newcivilengineer.com/latest/crossrail-tunnels-redesign-sees-cut-back-in-emergency-escape-shafts-03-04-2009/

Comments

Posting Rules

Reply