. Shield and compressed air tunneling . Third St., Los Angeles O 10 20^ 30 1^7/|Jc ^zoo Ro+herhi+he. LondonFig. 12.—Cross sections of highway tunnels—one- and two-way. usage and regulations. The problem is new, particularly as tothe width of the roadway, and only experience will show justwhat width is required for several lines of fast moving automo-biles to pass through a tunnel. GO SHIELD TUNNELING 9. Ventilation of Highway Tunnels.—An automobile developsfrom to cu. ft. of carbon monoxide gas per minutewhile running, and dissipates it into the air in the tunnel. Thesefigures are ta
. Shield and compressed air tunneling . Third St., Los Angeles O 10 20^ 30 1^7/|Jc ^zoo Ro+herhi+he. LondonFig. 12.—Cross sections of highway tunnels—one- and two-way. usage and regulations. The problem is new, particularly as tothe width of the roadway, and only experience will show justwhat width is required for several lines of fast moving automo-biles to pass through a tunnel. GO SHIELD TUNNELING 9. Ventilation of Highway Tunnels.—An automobile developsfrom to cu. ft. of carbon monoxide gas per minutewhile running, and dissipates it into the air in the tunnel. Thesefigures are taken from tests made for the Hudson River VehicularTunnel and the general result of the tests is that the exhaust. \< 4/.4^ Second Street^Los Angeles <-/.Sd
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