SNiP VSN 25-86: SAFETY of MOVEMENT ON HIGHWAYS by NATIONAL CODES & STANDARDS OF RUSSIA (SNIP)

By NATIONAL CODES & STANDARDS OF RUSSIA (SNIP)

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Thus it is necessary to avoid introduction of curve small radiuses on sites of transition from an old line to to the rectification . 3. Correction of a longitudinal structure of roads can be demanded: а) On the underestimated sites from which water drainage is not provided; б) On sites wrapping a structure with poor visibility in a cross-country terrain; в) For mitigation of steep slopes and descents(releases) or improvement of conditions of movement on such sites; г) For maintenance of smoothness of road at often sawtooth crises of a longitudinal structure because of a small step of designing.

6) Fig. 6. The instruments used must preliminarily pass calibration with the base instruments, existing/available in MADI and Soyuzdornii The results of measurements are used for scheduling linear of coefficients of adhesion (Fig. 7). Fig. 7. 4. 1. A degree of danger of crossings define(determine), using the statistical data on road and transport incidents (DTP). If on crossing for 10 years it is registered more than three DTP it, as a rule, means, that the lay-out and an arrangement of crossing on road are unsuccessful.

Tortuosity of a line eliminate whenever possible without an output(exit) for limits of an existing strip of tap(removal). Road straighten rather short sites to the greatest degree to use an existing earthen cloth and road clothes if they satisfy to technical requirements and are not subject to the formation of swells . For elimination of tortuosity of a line it is possible not only to straighten separate sites but also to arrange the curves of the big radiuses uniting a little bit(some) of short straight line and curves.

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