Civil Engineering ⇒ Topic : Road geometrics
The visible dimensions are technically known
as road geometrics. Road geometrics can be
divided as follows :-
1. Right of way or permanent land width
2. Road margins
3. Formation width
4. Carriage way width
5. Shoulders or footpath1. Right of way : It is the area of land acquired and reserved for construction and development of the road along its alignment.
6. Side slopes
8. Formation level
9. Camber or cross fall or cross slope
11. Super elevation
Permanent Land width as per Recommendations of I.R.C.
2. Road margins : It is the portion of land
width on either side of formation width of a road.
It includes footpaths, cycle track, guard raid,
embankment slopes and parking lane etc.
4. Carriage way : It is the portion of the
roadways used by vehicular traffic. It is in general
the metalled portion of the road as per Indian
Road Congress (I.R.C.) it is 3-8 metre for single
lane traffic and 3-5 m. per lane in case of two or
more than two lanes.
10. Gradient : Gradient is the longitudinal
slope of the road. The slope of the road which is
adopted in road design and calculations of cuts and fills is called 'Ruling Gradient'. It is of three types :
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