Re:Silicon Valley bets on new transport to counter the rise ...
by dredmorbius on Wednesday July 13, 2022 @10:27PM
(#32091311)
From some recent HN discussions, a 2 minute headway for tracked transit seems to be the minimum based on both safe stopping distances and dwell time.
BART achieved 4 minute headways through the San Francisco subway portion. That also effectively limits headways on branch lines (absent additional trackage through SF) as when multiple 15m headway lines are combined the net headway is reduced.
For longer-haul commute service, 5--10 m headways aren't unreasonable, and a dedicated East-bayshore or Peninsula bayshore BART line might be able to accomplish this, with either a transfer or dedicated trackage in SF itself.
(Muni Metro runs on what was intended to be additional BART trackage.)
BART achieved 4 minute headways through the San Francisco subway portion. That also effectively limits headways on branch lines (absent additional trackage through SF) as when multiple 15m headway lines are combined the net headway is reduced.
For longer-haul commute service, 5--10 m headways aren't unreasonable, and a dedicated East-bayshore or Peninsula bayshore BART line might be able to accomplish this, with either a transfer or dedicated trackage in SF itself.
(Muni Metro runs on what was intended to be additional BART trackage.)
See:
https://news.ycombinator.com/item?id=31774765
https://news.ycombinator.com/item?id=31834413