Section 5(2) in The National Highways fee (Determination of Rates and Collection) Rules, 2008
(2)The applicable base rates shall be revised annually with effect from April 1 each year to reflect the increase in wholesale price index between the week ending on January 6, 2007 (i.e.,208.7) and [the wholesale price index for the month of December of the year] [Substituted for the words "the week ending on or immediately after January 1 of the year" by Notification No. G.S.R. 950(E), dated 3.12.2010 (w.e.f. 5.12.2008)] in which such revision is undertaken but such revision shall be restricted to forty per. cent of the increase in wholesale price index.
