A treatise on highway construction . Fig. 49. Double Reverse Curve. LOCATION OF COUNTRY KOADS. 467 587. The width of the wheelway on curves should be greaterthan that on tangents to permit the swinging of the teams and toprevent accidents; the amount of the increase in width dependsupon the character of the traffic using the road. The position inwhich the additional width will be of the greatest service to thetraffic is at the entry arcs, as shown at A and A in Fig. 49a, and. Fig, 49a. Widening Wheelway on Curves. not at the center (B) of the curve, which is the point commonly-widened. The min
A treatise on highway construction . Fig. 49. Double Reverse Curve. LOCATION OF COUNTRY KOADS. 467 587. The width of the wheelway on curves should be greaterthan that on tangents to permit the swinging of the teams and toprevent accidents; the amount of the increase in width dependsupon the character of the traffic using the road. The position inwhich the additional width will be of the greatest service to thetraffic is at the entry arcs, as shown at A and A in Fig. 49a, and. Fig, 49a. Widening Wheelway on Curves. not at the center (B) of the curve, which is the point commonly-widened. The minimum radius of the outer curve to provide the increasedwidth may be determined by the formula -i^-mi--- in which 2?=radius of the inner curve of the road;1^=width of road on tangents;w=width of vehicles;i=maxim\mi length of vehicles, including teams. 468 HIGHWAY CONSTRUCTION. If the traffic requires it a further widening may be obtained by-flattening the inner curve as indicated by abc. The radius of thereversing curves DD should be not less than 15 feet. 588. Excessive crookedness of alignment is to be avoided, forany unnecessary length causes a constant threefold waste: first,of the interest of the capital expended in making that unnecessaryportion; secondly, of the ever-recurring expense of repairing it;and thirdly, of the time and labor employed in travelling over it. 589. The curving road around a hill may be often no longerthan the straight one over it, for the
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