EXTRA WIDENING IN HIGHWAY | TYPES |USES
Width of pavement on curved road shall will be more than width of pavement on straight road to full fill following objective:
1> To take care of off tracking due to rigidity of wheel base .
Note : Deviation of path traverse by fornt and rare axal of any vehicle on curved road is known as off tracking .
2> To counter act transverse skiding of vehicle .
3> To increase the visibility of curve .
4>To encounter psychological tendency of the driver to maintain more side gap while over taking
Extra Widening (We)= Wmech+Wphy
=nl^2/2R +V(kmph)/9.5R^.5
n -number of lane
l -length of wheel base
R- radius of circular curve
V -design speed of road
it is to be noted here that l^2/2R is off tracking where as
nl^2/2R is mechanical widening
NOTE :
1> if R > 300m then generally there is no need to provide extra widening
2> if 50< R< 300 m provide on both side of the curve .
1> To take care of off tracking due to rigidity of wheel base .
Note : Deviation of path traverse by fornt and rare axal of any vehicle on curved road is known as off tracking .
2> To counter act transverse skiding of vehicle .
3> To increase the visibility of curve .
4>To encounter psychological tendency of the driver to maintain more side gap while over taking
Extra Widening (We)= Wmech+Wphy
=nl^2/2R +V(kmph)/9.5R^.5
n -number of lane
l -length of wheel base
R- radius of circular curve
V -design speed of road
it is to be noted here that l^2/2R is off tracking where as
nl^2/2R is mechanical widening
NOTE :
1> if R > 300m then generally there is no need to provide extra widening
2> if 50< R< 300 m provide on both side of the curve .
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