The 'EST goes EAST' project was launched jointly by the OECD, UNEP and the Austrian Federal Ministry of Agriculture, Forestry, Environment and Water Management within the framework of the Central European Initiative (CEI). It followed on from the 'EST' project. 

The focus of 'EST goes EAST' was on the promotion of EST in Central and Eastern Europe. It followed on from the 1997 "Declaration towards Sustainable Transport in the CEI Countries", which was endorsed by the ministers of 16 countries from the region. This recognised the urgent need to develop policies for sustainable transport in the region, and to place environment and health issues high on the transport agenda to ensure their full integration into the development of transport policy. The project used the OECD-developed EST methodology, as well as previous research undertaken in the framework of the 'EST' project, to map out strategies for achieving EST in the CEI region. As part of this project, a pilot study was undertaken by UNEP, OECD and the Austrian government in 1999, followed by a more comprehensive study in 2002 on applying EST in the countries of Central and Eastern Europe. An additional study was undertaken to identify the external costs of transport in the region. This Clearing House was also developed as part of the overall EST goes EAST project.

Whilst the 'EST project' itself has now finished, its legacy can be seen in a wide range of international work and cooperation. Sustainable transport is now core to many pan-European initiatives, not least the transport policy of the European Union as set out in its 2011 Transport White Paper. At a pan-European level, WHO and UNECE's Transport, Health and Environment, Pan-European Programme (THE PEP) focuses on sustainable transport. European countries' commitment to the goals of sustainable transport was underlined in 2014's Paris Declaration, in which the signatories agreed to intensify their work towards "safe, efficient, accessible, affordable, inclusive, green and healthy mobility and transport" in support of sustainable livelihoods. Within Central and Eastern Europe, regional conventions are also highlighting the need to make transport sustainable, e.g. a 'Protocol on Sustainable Transport' to the Framework Convention on the Protection and Sustainable Development of the Carpathians was agreed in September 2014.