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154 for passing trucks and tractor combinations, with maximum limits under various conditions as given in table 4.

In general, extremely long grades should be less steep, and very short grades and grades to be traveled only in the downward direction on one-way roads may be steeper, than the limits given in table 4, but none shall exceed 7 percent.

Width of right-of~vay.—On rural sections of the system, the width of right-of-way to be acquired by purchase or outright condemnation shall be at all points at least sufficient to include the road surfaces or pavements and median strip, the shoulders, gutters, or ditches, and the side slopes of the road, constructed in accordance with the foregoing recommendations with full allowance for the widening and conversion of the traveled way and other cross-section features estimated to become necessary within a period of 20 years.

In addition, public control shall be obtained, either by purchase or outright condemnation or by the acquirement of highway development rights, over a strip of land of sufficient width to prevent the erection of any private structure or sign within a distance of not less than 100 feet from the outer edge of the road surface or pavement as it is likely to be constructed or converted within-a period of 20 years.

Substantial conformity with these right-of-way standards will require the obtainment of public control, in the manner and degree determined to be necessary, over a strip of land not less than 224 feet wide in the case of the most lightly traveled sections of the system to be improved initially with two-lane surfaces or pavements, and not less than 288 feet in all other cases.