asked Her Majesty's Government:

Whether their policies for the expansion of light rail adequately reflect the rising price of oil, the need to take account of climate change and the importance of dealing with congestion. [HL2703]

The benefits of light rail expansion are considered on a case by case basis and will vary according to the specific scheme being considered. The Department for Transport aims to consider all impacts of transport schemes including impacts on greenhouse gas emissions and changes in congestion. The assessment should also be informed by the best available evidence. The recent increase in the price of oil will be considered in the assessment of schemes although the impact of this is likely to be relatively modest. 

The methods and information used to assess the impact of a scheme are generally considered state of the art and are regularly reviewed. As part of this process the department is currently reviewing its appraisal techniques as part of the NATA (New Approach to Appraisal) Refresh. Recommendations about improvements to the assessment of schemes will be finalised after public consultation on the NATA Refresh closes on 31 March 2008.