An example from Commonia = [http://opengeofiction.net/#map=18/17.24328/140.42537]
As far as I know in New York City the blocks are 60 to 240 m. If you calculate as minimum
1) street a, right side driving lane 3 m, 2) parking lane 2 m, 3) footway 3 m, 4) house at street a 12 m, 5) inner block 10 m, 6) house at street b 12 m, 7) footway 3 m, 8) parking lane 2 m and 9) street b, left side driving lane 3 m = then you get 50 m. This is the absolute minimum for reasonable buildings inside of the blocks.
If you will do a good work for the inhabitants of your town - give them more room.
Comment from martinum4 on 9 April 2017 at 09:08
OGFs usual problem, scaling…
Comment from MrOobling on 9 April 2017 at 11:28
You can get smaller blocks than 50m - they are quite common. I’m not sure why you stated that a 2 lane road with a parking lane and 3m footway are necessary but most roads don’t have these things. Just one lane with no pedestrian path is very common.
Look in Tokyo, Japan (https://www.openstreetmap.org/#map=14/35.6731/139.7982), you can see many blocks just 20m wide- and this is in a developed country. In a undeveloped country, similar to Commonia, like Kolkata’s slums (https://www.openstreetmap.org/#map=18/22.53308/88.38337), blocks are so small that roads or paths between them cannot be mapped.
Comment from MrOobling on 9 April 2017 at 11:29
It’s worth noting though that I agree that there is a serious scale problem. Airports particularly are too small and railway curves are too tight.
Comment from Thunderbird on 9 April 2017 at 16:55
Patriot City’s center city blocks are mostly 250 feet by 250 feet (76.2 meters) or 250 by 500. Anything much smaller than this is really too small.
Comment from Portopolis on 9 April 2017 at 17:46
I disagree, ever been to any third world country or even Istanbul Turkey. This is how they get ridiculous densities like 100,000 per square km with no tall buildings. Houses are very small and blocks are two. Play the Parkman feature in the U.S and then play it in Japan(another developed country) the size different is crazy. Same with Lagos, my suburb and the core region of Lagos is about the same size. One city has 300,000 people while the other has 12-17 million people. Block size and spaces between houses plays a huge role. The suburban areas of America, houses are far apart, streets are wide, and their are things like Backyards, all of this makes American blocks massive compared to other cities.
Comment from histor on 9 April 2017 at 18:11
My example is not from the inner area af an old city - there indeed you can have smaller streets, smaller houses and smaller blocks. The example is from the usual urbanisation after the1860ies.
Comment from isleño on 9 April 2017 at 22:38
As Portopolis mentioned, Japan is a country where the blocks can be very small, and not just in the inner area of an old city. For example here’s a modern suburban district developed in the late 20th century, where the blocks are less than 30 m wide. Looking at street view, the atmosphere is obviously quite different from a typical suburb in Europe or the US… perhaps not what those mappers in Commonia were imagining. :-)
Comment from histor on 9 April 2017 at 23:30
O my God …
In the center of an old european town … [http://www.openstreetmap.org/?box=yes&bbox=10.3813094%2C53.0833975%2C10.5882109%2C53.2035945#map=17/53.24956/10.41040]
Comment from zhenkang on 10 April 2017 at 11:15
Possibly you can change some of the roads to pathways for small markets, instead of deleting them. Or otherwise then you can transform the place into a park if you want, if the roads surrounding are changed into footpaths, a trade-off for greenery instead of housing haha.
Comment from tule00 on 11 April 2017 at 17:19
In some extreme cases it can be 20 to 30 m, but only in planned suburban areas.
Comment from The_Cute_Chick on 10 June 2018 at 09:01
This is what I have been doing in Charlington – changing the classifications of the road network by loosely following a road pattern: change every 4 streets into a living street and change every 2 streets into a footpath.
And I have completely redone [the intersection] (or rather the intersections as it is now)](https://opengeofiction.net/#map=18/17.24328/140.42537) in the link @histor have provided in this user diary post.