Truth About Motorways Pty Ltd v Macquarie Infrastructure Investment Management Ltd,[1] is a landmark Australian judgment of the High Court.

The third party, a community group called Truth About Motorways, sought a writ of prohibition against Macquarie Infrastructure Investment Management Ltd to stop the publishing of a prospectus calling for investors in a new toll road proposal in Sydney.

The prospectus, claimed Truth About Motorways, was misleading with regard to the number of cars that would use the road and sought an order compelling the publication of corrective advertising.

Such action they claimed was misleading contrary to the Trade Practices Act 1974.

The litigation was ultimately dismissed because the community group was unable to provide security for Macquarie’s legal costs,[3] but the decision is important as it established a very wide standing in matters of the public interest.