The base toll of $2.50 in 1999 prices was increased by 15 cents (to $2.65 then) for cars, and by 30 cents for heavy vehicles. This higher base has also been subject to escalation of four per cent a year. So the toll at the time of the tunnel opening was approximately 20 cents, not 15 cents, higher for cars.
The RTA and CCM formalised this change in the First Amendment Deed (FAD), signed in December 2004. This is the only variation to the original contract.