Question

Estimate the total width of right-of-way (ROW) of a depressed divided rural

highway with three lanes in each direction. Show the median, shoulders lanes, side

slopes, and so on, with recommended dimensions on a cross-section of the highway

Answer 1

1).Lane width of Carriageway
The standard lane width of the Project Highway shall be 3.5m

Median
Table 2.2: Width of Median
Minimum Width of Median (m) depends on the Type of Section Plain and Rolling terrain mountainous an steep terrains

shoulders

the shoulder width on the outer side of the road shall be provided as

1).the road way width depends on the width of carriage way , median and side shoulders

2). on horizontal curve extra width provided as per guidelines

FOR GIVEN NOTHING MENTIONED ABOUT TERRAIN CONDITIONS

so if we can assume it is a plain and rolling terrain

Adopted lane width for national highways is India is 3.5m. Accordingly, total width of six lane highway becomes 21m. In addition to this, as per recent Indian Road Congress’s lane manual IRC SP-73:2015, 1.5 m paved shoulder and 2.4 m earthen shoulder should be provided on each side for two lane roads. median provided at non signal areas should be 7m.So total width of 6 lane road becomes 6(3.5)+2(1.5+2.4)+7 = 35.8m.