Post #1015813
2026-04-04 03:31 UTC
If you are someone who cares about #urbanism, you probably have heard about the Leading Pedestrian Intervals (LPIs), which means to give pedestrians a 3–7 second head start before vehicles get a green light in the paralleled direction. What you might not think about is the streetlight interaction with LPI.
Replies (1)
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@kkavee@urbanists.social 2026-04-04 03:32
Based on a part of our recent study #LPI at night moves pedestrians out of the dark curb zone and help pedestrians get peak semi-cylindrical #illuminance for incoming traffic occurs around 2–3 seconds into crossing. At a #walking speed of 1.4 m/s, our #SALUSLux simulation indicates an ideal LPI of 3–7 seconds. For pedestrians facing turning conflicts (and I personally experience this a lot even near #CMU campus -*-), peak visibility on the far side occurs around 7 sec