File:Arnold (1913) pg 220.jpg
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| Description |
English: Figures 49, 50 and 51 - Sections of tunnels to Harbor View.
Figure 49. Section recommended for Fillmore Street tunnel, completely segregating vehicle and railway traffic, thus permitting high speed operation, with alternative plans for foot-passageways using either bore. Figure 50. Single-bore section for Fillmore Street tunnel, with various classes of traffic separated only by railing. The limitations of a 20-foot roadway for three lines of vehicles are evident. Figure 51. Single-bore arrangement for Divisadero Street and Broadway tunnels. This section, being six feet wider, permits more sidewalk space, and ample room for three lines of vehicles in the center roadway. |
| Date | |
| Source | Arnold, Bion J. (March 1913) "11. Market Street extension tunnel under Twin Peaks" in Report on the Improvement and Development of the Transportation Facilities of San Francisco, pp. 225–270 Retrieved on 17 April 2018. |
| Author | Uncredited illustrator(s), drafter(s), and photographer(s). First published by and generally credited to Bion Arnold |
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This work is in the public domain in the United States because it was published (or registered with the U.S. Copyright Office) before January 1, 1929.
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