EXTRA WIDENING IN HIGHWAY | TYPES |USES

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EXTRA WIDENING IN HIGHWAY | TYPES |USES

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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 .

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