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The following data are related to a horizontal curved portion of a two-lane highway: length of curve $200$ m, radius of curve $=300$ m and with of pavement $=7.5$ m. In order to provide a stopping sight distance (SSD) of $80$ m, the set back distance (in m) required from the centre line of the inner lane of the pavement is

  1. $2.54$
  2. $4.55$
  3. $7.10$
  4. $7.96$
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