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Show HIGHWAY OFFICIALS AGREE ON PRINCIPAL SPECIFICATIONS FOR 1921 HIGHWAY PROGRAMS A group of the leadinp highway engineers en-gineers of America, sitting in Nen York in a two-day conference an a 1 technical commit t- of the Lincoln 1 Highway association to decide on ipe -,lfications for the ideal section to be I built on the Lincoln highway as an example to the world of the best type of main -traveled highway that can be constructed have agreed on the prln-Iclpal prln-Iclpal specifications, I The Anmneers had before them the 'specific problem of designing a petition pet-ition which, without compromise with I the question of available funds, would I represent the concensus of the best engineering opinion of the United States as to the most economical In-I In-I vestment of public funds on main Interstate In-terstate routes of travel- The United states Rubber company, which has furnished the funds for the construction construc-tion of the section, has expressed the hope that a section can be built that (will he the hest that modern engineering engin-eering cm devise and that at the same time will be in its essential details de-tails within the reach of the pocket -look of the average state or municipality. munici-pality. The following general specifications were adopted subject to re If w at the final meeting of the committee to be held soon in Chlcapo v PEC1FICATU is MLAD1 1. The specifications for the ideal section are to be predicated upon an average traffic of 15,000 passenger automobiles per twenty-four-hour day. traveling at a speed of thirty-five miles per hour, and n.OOO motor trucks per twenty-four-hour day. traveling at an average speed of ten miles per hour. 2. The width of rip:ht-of-way for the ideal section shall be 100 feet. 3. The drainage for the ideal section sec-tion shall consist of suhmcrcnl drain tile ami catch basins 4. The ideal section shall be const con-st tinted of concrete, ten inches thick, with reinforcinp steel embedded. 5. The Ideal section shall be designed de-signed with earth shoulders on each -il of the concrete. 6. The ideal section shall be lighted. 7 The ideal section's technical! cemmitte.- recommends that neither the Ideal section nor any other road 1 should be built without adequate. In-1 telliKent, continuous and prompt maintenance being provided. 8 The Ideal section should embody em-body no curves having a radius of lesv than 1,000 feet and wherever j reasonably possible curves should be limtnaled entirely. 9- Curves on the ideal section shall In- super-elevated for speed of thirty-five miles per hour 10. The ideal section shall provide a foot path for pedestrians 11. The ideal section shall be equipped with guard and warning slRns and all embankments shall be protected by guard rails 12. Specifications for the Ideal section sec-tion shall be predicated n the ultimate ulti-mate regulation of motor truck de-sipn, de-sipn, limiting the super-imposed load to 800 pounds per Inch of width of tire actually in contact with the road surface and to 8,000 pounds per wheel GR IDE CROSSINGS 13. n the ideal section all crossings cross-ings at prrade shall be eliminated. 14. The technical committee recommends rec-ommends the establishment of comfort com-fort stations, park sites and camp sites alonq the ideal section 16. All wires along the Meal section sec-tion shall be placed underground. 10 All advertising signs are prohibited pro-hibited along the right-of-way of the Ideal section and all sins of direction direc-tion or distance, except those placed (or authorized by proper state authority, author-ity, are prohibited I 17. It is the sense of the Ideal sec-1 sec-1 tlon's technical committee that all distance markings should originate at the municipal headquarters of any ' 1 own 'or city- 18. It Is the sense of the ideal sce-Itlon'fl sce-Itlon'fl technical committee that Insofar Inso-far as may bo practical ail obstructions obstruc-tions to tho vision shall be removed at Intersecting roads for a distance Of at least COO feet each way from the Intersection. One of the most Important matters I to be decided upon by the ideal section sec-tion committee and which must prc-Icede prc-Icede any construction Is the question jof cross section design, i e., the number num-ber and arrangement of traffic lanes to be provided on the Ideal section. This was practically the only point upon which a disagreement was encountered, en-countered, some of the engineers feeling feel-ing that the construction of a thrtBS- traffic-lane pavement, say twenty-Beven twenty-Beven feet wide, would be the proper procedure, while othei-s preferred the construction of a four-tra f f Ic-lane. srparated by a central parkway to the end of sccrefcatinc travel according accord-ing to direction, others were favor 01 separate travel lanes for motor trucks and pasi-enKcr cars. The Lincoln Highway association is having competent engineers draw up suggested specifications for each of these Cross section designs and the matter will be carefully considered at the next meeting of the technical cr mmil tee The Lincoln Highway association, as well as the office of public roads of the federal government, will issue bulletins concerning the Bpeclf lcatione I determined upon. |