this post was submitted on 30 Sep 2023
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Fuck Cars

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[–] [email protected] 6 points 1 year ago (1 children)

Quick search gave this number:

Theoretical maximum saturation flow rate per lane (this will allow you to do quick calculations in your head to check reasonableness at big events): 1,900 vehicles per hour per lane

So the bottom would probably be more like 25K each way. Lightrail is only about 4-8k? Meanwhile a single subway lane each way could do more than that thing on the bottom left.

[–] grue 13 points 1 year ago* (last edited 1 year ago) (1 children)

I'm guessing you found this source: https://www.mikeontraffic.com/numbers-every-traffic-engineer-should-know/

The number from that page he should actually be using is more like this one:

Planning level daily capacity of a road (Round numbers based on Level of Service D/E thresholds in HCM 6th Edition)

  • 2 lane (w/ left turn lanes): 18,300 vehicles per day

(Source: I'm a former traffic engineer.)

[–] [email protected] 2 points 1 year ago

Yup.

What does "should" mean in this context? Wouldn't it depend on if you are trying to compare peak capacities or daily usages? I'd assume which one matters more would vary based on why you are comparing them in the first place?