On 15th June 2011, Professor David Hensher presented a seminar, asking 'Should Motorists Pay for the Congestion they Cause?' Roads are possibly the most underpriced in terms of user contributions of all the public assets that we avail ourselves of. Regardless of whether some believe that governments should provide more road capacity to combat traffic congestion, it is an undeniable fact that if we provide more capacity under the existing road user pricing regimes (registration and fuel pricing only), then more cars will use the roads, quickly using up the additional capacity. The great sadness about all of this is that there is a presumption that we all have rights to enter the traffic and delay all other motorists, yet not contribute to the true cost associated with delay and lost time – the curse of congestion. This results in a predictable 'tragedy of the commons'. This talk is part of an ongoing conversation to discuss replacing fixed charges with car use related charges, with congestion charging regimes included as one part of a future variable user charging policy.   David Hensher is Professor of Management, and Founding Director of the Institute of Transport and Logistics Studies (ITLS): The Australian Key Centre of Teaching and Research in Transport Management in the Business School at The University of Sydney. He is a Fellow of the Academy of Social Sciences in Australia (FASSA) and has won many awards. David is on the editorial boards of 10 of the leading transport journals. He has published over 450 papers in leading transport and economics journals and in many books. The presentation is available Hensher Seminar PPT Presentation