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| Re: Queens Bus Redesign Results In Slower Speeds (350832) | |||
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Re: Queens Bus Redesign Results In Slower Speeds |
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Posted by Stephen Bauman on Thu Mar 5 12:58:01 2026, in response to Re: Queens Bus Redesign Results In Slower Speeds, posted by New Flyer #857 on Thu Mar 5 08:54:59 2026. Accepting the numbers, can it be explained?I should have mentioned that this data was calculated from the MTA's published GTFS schedules. It's possible they need a reality check. I was interested in the planning planning results. Somebody at the MTA should have run a similar sanity check and asked "what's going on"? There is another explanation that's a work in progress on my part. It stems from my asking this question: Given that stop distance, turns, traffic signals influence bus speed, what's the relative importance of each parameter? Bus stop spacing is the easiest data to obtain. It's available from every GTFS schedule that includes the optional shape file. Most US operators include this file. Most foreign operators don't. I just finished running a correlation analysis for bus stop spacing and bus speed for 51 of the largest cities in the US. The results showed a rather weak value of 0.27. This suggests that there might be a missing parameter that isn't being considered. I have my own favorite candidate. The correlation came back around -0.76 which means a much heavier negative influence. Further analysis, assuming an exponential or power relation, rather than a linear relation, brought the correlation up to -0.85. NYC's value for this parameter is very high. This means it would swamp out any changes made by increasing stop spacing. I've submitted my analysis to two others for peer review. I'll see what happens. |
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