ABSTRACT
This chapter uses the information about the contribution strategy to make recommendations about who should pay. It shows how the grounded theory can help decide between design options for a road pricing scheme. The London research programme concurs with the grounded theory recommendations that discounts and exemptions can be given on the basis of who is making the trip and the type of vehicle used. The chapter discusses the London study takes a more practical view of the decisions and focuses on opportunities for abuse of systems of discounts and difficulties in operation. It analyses the arguments for awarding exemptions and discounts to different groups of drivers by looking for patterns in the use of the contribution strategy. It was found that arguments for charge privileges are typically based on the size of impact of a vehicle and the how essential it is that a person has the option of driving.
