@DemonHusky @bikepedantic Was the assumption that the default was 30 mph? Because IIRC there isn't a distinction between 25 and 20 in how PfB calculates LoS.

@haraldkliems @bikepedantic Someone a few years ago manually added 25mph speed limits throughout Cambridge in OSM. This probably wasn't the "correct" way as most of those streets would have been unsigned. A couple of years ago Cambridge changes the speed limit for most of the city to 20mph, but due to state law, had to sign every street. This wasn't updated in OSM.

@haraldkliems @bikepedantic P4B ratings are simplified LTS ratings, roughly saying LTS1/2 are low stress and LTS3/4 are high. For residential streets of Cambridge's width, going from 25mph to 20mph changes from high to low in their analysis.

You can see their full tables here https://cityratings.peopleforbikes.org/about/methodology

@haraldkliems @bikepedantic It might be also worth noting that most MA streets have widths in OSM since that data was included in the state database when it was imported, so Cambridge streets don't use the assumptions on street width that other cities would.

@DemonHusky @bikepedantic Ah, I see! That seems to be the key part and what I was thinking: On a residential street with default assumptions about width, 20 vs 25 doesn't make a difference; on a narrow street it does. (Table 5b). Thanks.

@Ofsevit I love imagining her hating all this great stuff. The next huge bike bus event we do, i'm really tempted directly email her a video with something snarky.

@bikepedantic she probably hates children and puppies too