The 1990s saw a dramatic increase in theliberalization of transport policies and a strengthening ofthe role played by private operators and investors intransport infrastructure. Most of these reforming countriesare creating new regulatory agencies. This book aims is tocontribute to the development of these regulatory skills.The book has two parts. Chapter 2 in the first part providesan overview of why economic regulation is important. Itprovides theoretical support to the sector-specific chaptersthat constitute the second part of the book. The second partcovers four subsectors: airports, ports, railways, androads. Each chapter follows exactly the same structure. Thefirst section provides snapshot of the key economiccharacteristics of the sector and discusses their relevancefrom the viewpoint of a regulator. The second sectionsummarizes the main privatization and regulation trends thathave been observed in the sector. It gives an overview ofmain options offered by international experience and coversa few case studies that illustrate those options. The thirdsection covers price regulation and highlights theprice-related issues that characterize the sector. Thefourth section does the same for quality regulation. Thefifth section discusses the main performance indicators thatthe sector's regulators should be able to rely on to beeffective in their jobs.