International Library of Technology · Scranton, International Textbook Co. · leaf 266
to pass eachother on curves. Special attention must be paid to thisfeature where the center-pole method of line constructionis used. There are many roads on which the curve clearanceis not over 2 or 3 inches, but in most of such cases there is arule against passing on curves. 50. Transition, or… … Fig. 50. Fig. 51. of laying out a curve would be to make a true spiral connec-tion between the end of the straight track (called thetangent) and the center of the curve, but this would bepractically impossible. Some engineers advocate a nearapproach to such practice by starting with a radius of…
Electrical engineering
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