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Originally Posted by numble
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OK so I'm way late to this party but I just wanted to point out that there is a clear demand gap between the Van Nuys corridor and the Sepulveda Pass corridor. Van Nuys is a good corridor but it doesn't match up with the nearly 300,000 AADT for Sepulveda Pass. You could potentially fill a long train every 2 minutes at rush hour with demand like that, whereas a train every 5 minutes or so would probably be enough on Van Nuys for the next 100 years.
Concepts 1, 2, 5, and 6 acknowledge the difference in demand by using a different technology (HRT or Monorail) and terminating it at the Orange Line, where it is fed by other lines using different technology (LRT up Van Nuys and BRT along the Orange Line.)
Concept 3 does create one-seat rides on the Van Nuys corridor but it just addresses the demand gap by short turning every other train at the Orange Line.
Concept 4 (my preference) seems to be laying the groundwork for eventual LRT conversion of the Orange Line (west of Van Nuys anyway) into a future branch of the Sepulveda Pass line. It also makes the at-grade line along Van Nuys make more sense - this is the beginning of a subway-surface network for the Valley.