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- Xref: sparky sci.environment:9920 sci.physics:11545 sci.energy:3621
- Newsgroups: sci.environment,sci.physics,sci.energy
- Path: sparky!uunet!sun-barr!ames!agate!overload.lbl.gov!s1.gov!lip
- From: lip@s1.gov (Loren I. Petrich)
- Subject: Re: Is car pooling for real? (was Re: Are bikes really less polluting?)
- Message-ID: <1992Jul24.104318.29346@s1.gov>
- Originator: lip@s1.gov
- Sender: usenet@s1.gov
- Nntp-Posting-Host: s1.gov
- Organization: LLNL
- References: <1992Jul21.044006.15912@monu6.cc.monash.edu.au> <4xdmd6h@dixie.com> <Brsryo.BxL@watserv1.waterloo.edu> <1992Jul23.004537.4803@s1.gov> <1992Jul24.042149.5038@ke4zv.uucp>
- Date: Fri, 24 Jul 1992 10:43:18 GMT
- Lines: 39
-
-
- In article <1992Jul24.042149.5038@ke4zv.uucp>, gary@ke4zv.uucp (Gary Coffman) writes:
- :In article <1992Jul23.004537.4803@s1.gov> lip@s1.gov (Loren I. Petrich) writes:
-
- [muggings, murders, etc. on mass-transit systems...]
-
- But there are serious crimes associated specifically with cars:
-
- Car theft.
-
- And car-stereo theft.
-
- :> Furthermore, BART survived the Loma Prieta earthquake without
- :>any serious damage, while there was some serious highway damage -- the
- :>collapse of much of the West Oakland segment of I-880, the fall of one
- :>of the spans of the Bay Bridge, and some damage to the Embarcadero
- :>Freeway. Now which is more earthquake-safe?
-
- :That's not proof. If BART lines passed through the same liquifcation
- :zones, and if it was built during the same time period to the same
- :codes, it might have been *less* safe than I-880 with even more deaths
- :and injuries. Earthquake damage was not uniform throughout the Bay Area.
-
- In principle, roads and road bridges and tunnels can be built
- as safe as BART's tunnels and aerial structures have proved to be,
- BUT, what about a lot of the older bridges and tunnels that are NOT up
- to present-day earthquake standards? It would need a heck of a lot of
- money to upgrade many of the older bridges and tunnels. I have some
- documents relating to the construction of BART's Transbay Tunnel, and
- its designers had earthquake resistance as an important design factor.
- It was built from a long string of cast-iron segments that were
- lowered into a trench and filled with concrete. When the tunnel was
- finished, some mud was poured back onto the tunnel segments, burying
- it. The tunnel is currently protected from corrosion by an electric
- current that inhibits the oxidation of the iron.
-
- [Discussion of bus (in)efficiency omitted]
-
- /Loren
-