This paper presents the results of applying a policy model to simulate the effects on greenhouse gas emissions from trucking in Sydney of various abatement scenarios. These include vehicle efficiency scenarios, traffic efficiency scenarios and alternative infrastructure and land use scenarios. The model developed is quite comprehensive. It includes the effects of the interaction of trucks with car traffic in the city. And it extends the results, not only to the recognised greenhouse gases, but also to the effect of the scenarios on pollutant emissions from road transport and thus on pollution in the Sydney airshed.